@Athorcis can you review and verify this fixes #12970 ?
I've tried this but it doesn't seem to resolve the steps described in your issue.

@zaggino i'll try and i'll let you know

@zaggino Just tested it again on Windows & Ubuntu with the latest master and it works fine with the steps described in the issue. I may have missed something so I'll take another look later

Reset the branch, I think I messed up my fork somehow. Should work fine now.

I was able to produce a fix for the steps in the issue but I didn't try using .twig files (issue describes step 2 as any file type that's not supported). I can now see that overriding .twig is a specific scenario that doesn't work, but all other extensions are fine.

So I've added a fix for this as well. You can now override .twig files and make it work with the Twig language.

Apologies for any spam.

Thx for your work, i don't have the bug anymore

@haslam22 let me know when you think it's ready, I see you're still adding some commits.

@zaggino All finished now, thanks for taking the time to review.

reviewed & merged, thanks @haslam22 !

Nice job @haslam22 👍