This also goes for
{ADMINEMAIL}, {ADMINNAME}, {PASSTRHU: ...} and {SAVEDID}

question is: was it EM variable or replacement keywords?

I only tested with the keywords indicated in my description.

indeed, it was replacement keywords....
https://github.com/LimeSurvey/LimeSurvey/blob/2.06lts/application/helpers/replacements_helper.php#L538

So I'd say for 3.0 we can keep them (I will create a new and cleaner templatereplace() function for those keywords ) but mark them as obsolete, they should be replaced by twig statement/filters

Will twig statement/filters work in question text?

Is there documentation somewhere for the available twig statement/filters?

we should discuss about that topic on next team meeting. I'm not going to take decisions alone concerning that topic.
for now, I must fix the bug ;-)

also about the list of twig statements/filters/functions:
https://github.com/LimeSurvey/LimeSurvey/blob/master/application/config/internal.php#L253-L270

they must be allowed one by one in the sand box config, so they are all in the sand box.

here for the custom twig functions for LimeSurvey:
https://github.com/LimeSurvey/LimeSurvey/blob/master/application/core/LS_Twig_Extension.php

Thanks Louis.

Fix committed to master branch: http://bugs.limesurvey.org/plugin.php?page=Source/view&id=25960

Version 3.0.3 released.