I'm not joining the chorus condemning Bun for the vibe-rewrite, and I think it's fascinating whether it turns out to be a complete trainwreck or not. But FFS, it should have been a separate repo.
The issues should absolutely be kept. The rewrite was file by file translation so logic bugs would remain. It's valuable to ensure the memory bugs are in fact fixed. Starting the issues from nothing does not make any sense to me.