It seems that if you prepare a transaction, call rollback to stable (to before the prepare), then abort the prepared transaction, we assert/crash. The crash is "unable to locate update associated with a prepared operation: WT_NOTFOUND: item not found" and happens in __txn_search_uncommitted_op; it happens because the update associated with the transaction op has been aborted/removed by rollback to stable and is therefore not found by the cursor search in __wt_btcur_search_prepared.

All of that is reasonably clear. It's not so clear what to do about it, so it seemed like a good idea to file the ticket so it can be discussed.

I'm going to attach a simple reproducer.