Just to end this thread, here's the solution I've adopted:
- I no longer track modifications (.TrackRevisions = False)
- in most cases, I simply process my corrections with or without MatchWildcards.
- finally, I've created a procedure that compares the original files and those to which the punctuation correction has been applied. This creates a comparison file where the corrections are clearly highlighted.
Thanks for your contributions!

PS: I'd just like to remind you that this problem comes from an unhandled error in VBA. We can't track changes and use group captures correctly in our find/replace.