Duplicate multipleshorttext with the intention to create a question_theme. Change the name on config.xml to match the new folder and provide a new name. Keep everything else the same

After enabling via configuration the new question_theme, when trying to select it, Limesurvey will make a request to:
https://mylimesurvey/index.php/questionAdministration/getAdvancedSettingsHTML?surveyId=198286&questionId=0&questionType=Q&questionTheme=my-multiple-short-text-question-theme

It will show a "Internal error in updateQuestionAttributes: [object Object] question theme" via alert and the request will fail with a 500 and the following stacktrace:

{
"success": false,
"message": "Illegal offset type in isset or empty",
"error": {
"code": 500,
"type": "TypeError",
"errorCode": 0,
"message": "Illegal offset type in isset or empty",
"file": "\/var\/www\/html\/vendor\/yiisoft\/yii\/framework\/i18n\/CMessageSource.php",
"line": 104,
"trace": "#0 \/var\/www\/html\/vendor\/yiisoft\/yii\/framework\/i18n\/CMessageSource.php(85): CMessageSource->translateMessage()\n#1 \/var\/www\/html\/vendor\/yiisoft\/yii\/framework\/YiiBase.php(620): CMessageSource->translate()\n#2 \/var\/www\/html\/application\/helpers\/common_helper.php(30): YiiBase::t()\n#3 \/var\/www\/html\/application\/extensions\/AdvancedSettingWidget\/views\/buttongroup.php(16): gT()\n#4 \/var\/www\/html\/vendor\/yiisoft\/yii\/framework\/web\/CBaseController.php(126): require('...')\n#5 \/var\/www\/html\/vendor\/yiisoft\/yii\/framework\/web\/CBaseController.php(95): CBaseController->renderInternal()\n#6 \/var\/www\/html\/vendor\/yiisoft\/yii\/framework\/web\/widgets\/CWidget.php(244): CBaseController->renderFile()\n#7 \/var\/www\/html\/application\/extensions\/AdvancedSettingWidget\/AdvancedSettingWidget.php(56): CWidget->render()\n#8 \/var\/www\/html\/vendor\/yiisoft\/yii\/framework\/web\/CBaseController.php(182): AdvancedSettingWidget->run()\n#9 \/var\/www\/html\/application\/views\/questionAdministration\/advancedSettings.php(31): CBaseController->widget()\n#10 \/var\/www\/html\/vendor\/yiisoft\/yii\/framework\/web\/CBaseController.php(126): require('...')\n#11 \/var\/www\/html\/vendor\/yiisoft\/yii\/framework\/web\/CBaseController.php(95): CBaseController->renderInternal()\n#12 \/var\/www\/html\/vendor\/yiisoft\/yii\/framework\/web\/CController.php(872): CBaseController->renderFile()\n#13 \/var\/www\/html\/application\/controllers\/QuestionAdministrationController.php(1842): CController->renderPartial()\n#14 [internal function]: QuestionAdministrationController->actionGetAdvancedSettingsHTML()\n#15 \/var\/www\/html\/vendor\/yiisoft\/yii\/framework\/web\/actions\/CAction.php(114): ReflectionMethod->invokeArgs()\n#16 \/var\/www\/html\/vendor\/yiisoft\/yii\/framework\/web\/actions\/CInlineAction.php(47): CAction->runWithParamsInternal()\n#17 \/var\/www\/html\/vendor\/yiisoft\/yii\/framework\/web\/CController.php(308): CInlineAction->runWithParams()\n#18 \/var\/www\/html\/vendor\/yiisoft\/yii\/framework\/web\/CController.php(286): CController->runAction()\n#19 \/var\/www\/html\/vendor\/yiisoft\/yii\/framework\/web\/CController.php(265): CController->runActionWithFilters()\n#20 \/var\/www\/html\/application\/controllers\/LSBaseController.php(145): CController->run()\n#21 \/var\/www\/html\/vendor\/yiisoft\/yii\/framework\/web\/CWebApplication.php(282): LSBaseController->run()\n#22 \/var\/www\/html\/vendor\/yiisoft\/yii\/framework\/web\/CWebApplication.php(141): CWebApplication->runController()\n#23 \/var\/www\/html\/vendor\/yiisoft\/yii\/framework\/base\/CApplication.php(185): CWebApplication->processRequest()\n#24 \/var\/www\/html\/index.php(161): CApplication->run()\n#25 {main}",
"traces": [
{
"file": "\/var\/www\/html\/vendor\/yiisoft\/yii\/framework\/i18n\/CMessageSource.php",
"line": 85,
"function": "translateMessage",
"class": "CMessageSource",
"type": "->"
},
{
"file": "\/var\/www\/html\/vendor\/yiisoft\/yii\/framework\/YiiBase.php",
"line": 620,
"function": "translate",
"class": "CMessageSource",
"type": "->"
},
{
"file": "\/var\/www\/html\/application\/helpers\/common_helper.php",
"line": 30,
"function": "t",
"class": "YiiBase",
"type": "::"
},
{
"file": "\/var\/www\/html\/application\/extensions\/AdvancedSettingWidget\/views\/buttongroup.php",
"line": 16,
"function": "gT"
},
{
"file": "\/var\/www\/html\/vendor\/yiisoft\/yii\/framework\/web\/CBaseController.php",
"line": 126,
"args": [
"\/var\/www\/html\/application\/extensions\/AdvancedSettingWidget\/views\/buttongroup.php"
],
"function": "require"
},
{
"file": "\/var\/www\/html\/vendor\/yiisoft\/yii\/framework\/web\/CBaseController.php",
"line": 95,
"function": "renderInternal",
"class": "CBaseController",
"type": "->"
},
{
"file": "\/var\/www\/html\/vendor\/yiisoft\/yii\/framework\/web\/widgets\/CWidget.php",
"line": 244,
"function": "renderFile",
"class": "CBaseController",
"type": "->"
},
{
"file": "\/var\/www\/html\/application\/extensions\/AdvancedSettingWidget\/AdvancedSettingWidget.php",
"line": 56,
"function": "render",
"class": "CWidget",
"type": "->"
},
{
"file": "\/var\/www\/html\/vendor\/yiisoft\/yii\/framework\/web\/CBaseController.php",
"line": 182,
"function": "run",
"class": "AdvancedSettingWidget",
"type": "->"
},
{
"file": "\/var\/www\/html\/application\/views\/questionAdministration\/advancedSettings.php",
"line": 31,
"function": "widget",
"class": "CBaseController",
"type": "->"
},
{
"file": "\/var\/www\/html\/vendor\/yiisoft\/yii\/framework\/web\/CBaseController.php",
"line": 126,
"args": [
"\/var\/www\/html\/application\/views\/questionAdministration\/advancedSettings.php"
],
"function": "require"
},
{
"file": "\/var\/www\/html\/vendor\/yiisoft\/yii\/framework\/web\/CBaseController.php",
"line": 95,
"function": "renderInternal",
"class": "CBaseController",
"type": "->"
},
{
"file": "\/var\/www\/html\/vendor\/yiisoft\/yii\/framework\/web\/CController.php",
"line": 872,
"function": "renderFile",
"class": "CBaseController",
"type": "->"
},
{
"file": "\/var\/www\/html\/application\/controllers\/QuestionAdministrationController.php",
"line": 1842,
"function": "renderPartial",
"class": "CController",
"type": "->"
},
{
"function": "actionGetAdvancedSettingsHTML",
"class": "QuestionAdministrationController",
"type": "->",
"file": "unknown",
"line": 0
},
{
"file": "\/var\/www\/html\/vendor\/yiisoft\/yii\/framework\/web\/actions\/CAction.php",
"line": 114,
"function": "invokeArgs",
"class": "ReflectionMethod",
"type": "->"
},
{
"file": "\/var\/www\/html\/vendor\/yiisoft\/yii\/framework\/web\/actions\/CInlineAction.php",
"line": 47,
"function": "runWithParamsInternal",
"class": "CAction",
"type": "->"
},
{
"file": "\/var\/www\/html\/vendor\/yiisoft\/yii\/framework\/web\/CController.php",
"line": 308,
"function": "runWithParams",
"class": "CInlineAction",
"type": "->"
},
{
"file": "\/var\/www\/html\/vendor\/yiisoft\/yii\/framework\/web\/CController.php",
"line": 286,
"function": "runAction",
"class": "CController",
"type": "->"
},
{
"file": "\/var\/www\/html\/vendor\/yiisoft\/yii\/framework\/web\/CController.php",
"line": 265,
"function": "runActionWithFilters",
"class": "CController",
"type": "->"
},
{
"file": "\/var\/www\/html\/application\/controllers\/LSBaseController.php",
"line": 145,
"function": "run",
"class": "CController",
"type": "->"
},
{
"file": "\/var\/www\/html\/vendor\/yiisoft\/yii\/framework\/web\/CWebApplication.php",
"line": 282,
"function": "run",
"class": "LSBaseController",
"type": "->"
},
{
"file": "\/var\/www\/html\/vendor\/yiisoft\/yii\/framework\/web\/CWebApplication.php",
"line": 141,
"function": "runController",
"class": "CWebApplication",
"type": "->"
},
{
"file": "\/var\/www\/html\/vendor\/yiisoft\/yii\/framework\/base\/CApplication.php",
"line": 185,
"function": "processRequest",
"class": "CWebApplication",
"type": "->"
},
{
"file": "\/var\/www\/html\/index.php",
"line": 161,
"function": "run",
"class": "CApplication",
"type": "->"
}
]
}
}

After some debugging, I arrived that translateMessage receive this structure:
Array ( [0] => Array ( [value] => Array ( [0] => 0 [1] => Hidden ) ) [1] => Array ( [value] => Array ( [0] => 1 [1] => Disabled ) ) )
Instead of this one:
Array ( [0] => Hidden [1] => Disabled )

Now, I think the problem is that when being a question_theme, it goes via here:
https://github.com/LimeSurvey/LimeSurvey/blob/6.5.11%2B240605/application/models/QuestionTheme.php#L1014

But not through here:
https://github.com/LimeSurvey/LimeSurvey/blob/5.6.11%2B230320/application/models/QuestionAttribute.php#L497

That line, I think is the code point where one structure is transformed into the other

As a workaround, I have changed my config.xml so the options are stored like this:

<options>
<option>Hidden</option>
<option>Disabled</option>
</options>

Instead of:

<options>
<option>
<value>0</value>
<value>Hidden</value>
</option>
<option>
<value>1</value>
<value>Disabled</value>
</option>
</options>

I think that I´ll be safe as long as I´m not using a value different from a number (but I have seen already a "hidden" value for field label_input_columns )

Hope with all this info is easy to solve