Hi Maxim,

> Bug: org-src-font-lock-fontify-block should be wrapped with save-match-data
> [9.3.7 (9.3.7-4-gba6ca7-elpaplus @ mixed installation!
> /mnt/c/Users/toz/Weiterbildung/Soft/Emacs/ and
> /mnt/c/Users/toz/.emacs.d/elpa/org-plus-contrib-20200615/)
>
> Notice “mixed installation!”. Often it is source of obscure errors.
> <https://orgmode.org/worg/org-faq.html#mixed-install>
>
> Maybe link to FAQ item should be added to bug report template when mixed
> installation is detected. Since mixed installation can be detected, I would
> consider issuing a message during loading of Org mode.

Ah, thanks for highlighting this. It sounds like “mixed installation” is a red
flag which should prompt a request to reproduce the issue with an unmodified
Org.

All the best,
Timothy