Syntax highlight do not always work

```
Version: 2024-12 M3 (4.34.0 M3)
Build id: 20241114-0154
```

I noticed since a while now that *sometimes* the syntax highlighting do not work (but can't find a reproducer yet).

What happens is that

1. I have a Java Editor open and syntax coloring is all fine
2. Then I edit the code (e.g. adding a space at end of line)
3. This suddenly makes some (but not all) blocks of code render without any highlights
4. Save the file and often coloring is back
5. In some cases the problem persist and only close/open the editor helps

I just wanted to let people know about this to probably share ideas how one can find out more details or if others have seen such issues already.

Start with a Java Editor in Eclipse 2024-12 M3 and follow the reported sequence: edit code, observe missing syntax highlights, save, and close/reopen the editor. Compare whether highlighting returns after each step and capture a reproducible example, since the report names no files, tests, or reliable reproducer. Done means the failure is reproducible and its cause and corrective change are identified.

Written by the indexing model from the issue text.