Recommendations about fixing an scm?

[xxxserxxx]

So, like several people, the 25.07 release broke a third-party syntax I was using for a language Helix doesn't support natively. I disabled it and have been doing without it. In the meanwhile, the project I was using appears to be abandoned, as it hasn't had any changes in seven months. I'm tired of waiting, and would like to fix this myself -- however, it's a steep learning curve for a one-off.

Where do I start looking to try to decypher what I need to translate from the previous language to the new one? From just poking around, the breakages appear substantial. Is there a migration document for scm maintainers for whatever backwards-incompatible changes that got included with 25.07?

For reference, the tree sitter I was successfully using before 25.07, and which I'll need to edit, is https://github.com/treeman/tree-sitter-djot