Fix committed to master branch: http://bugs.limesurvey.org/plugin.php?page=Source/view&id=25962

no idea how to follow that fix - my replacements_helper just has 413 lines (maybe something missing?)
If I redo your steps in my file the placeholder isn't shown anymore, but the variable is empty

now I got it - you fixed the assessments themselves, but as variables in questions or random text it doesn't work
token:token doesn't work there as well, so seems to be a general issue wit Variables - can confirm though: assessments themselves are fixed

"If I redo your steps in my file"?
You should take some time to learn to use git, it's pretty easy once you get it:
https://www.youtube.com/watch?v=HVsySz-h9r4

I fixed a similar bug before your fix, so you're missing a lot of things:
https://bugs.limesurvey.org/view.php?id=13134

The fix I pushed is for variables in question text ($qa[0]['text'])
https://github.com/LimeSurvey/LimeSurvey/commit/cd2341a82471975d376abf0c00db2612fd16eca2

and, thank you for your bug report: very useful
+1

just updated to 3.0.3 to be sure I didn't do something wrong.
{TOKEN:TOKEN} is still shown in the survey instead of the actual token (I use it in the end URL to restart the survey with the same token)

can confirm it's just in the end url - is this planned or still a bug?

it will be fixed in next release

Version 3.0.3 released.