Why not simply disable that feature? Auto-closing doesn’t make much sense in the first place, maybe after a year or so with no activity or the bug is solved, but a month?
What happens when two months later someone wants to discuss / ask a question about a bug or topic, searches, finds the closed thread and decides to open a duplicate one?
EDIT: Another community had the same question: Should topic threads stay open or be closed after 90 days? - Meta - SketchUp Community