Version 2.1.0 of the T4 Blank Template Bs5 introduced "<bootstrap>bs5</bootstrap>" in line 77 of templateDetails.xml.
This causes an 500 Internal Server Error when accessing several of my installed components. As soon as I remove <bootstrap>bs5</bootstrap> from templateDetails.xml it is fine again.
You will not most likely say that you are not repsonsible for those extensions. Still the change on your side triggered this behaviour.
Could you please check?
Do others experience similar errors?