When we call SyncManager::imediately_run_file_actions during manual client reset recovery while someone is holding a lock for the file (e.g. open the Realm with Studio on Windows), Core will report the action as successful even if it fails. The reason is that when the action is DeleteRealm, the result from remove_realm is ignored and we always return true:

https://github.com/realm/realm-core/blob/165bb205de58ce87a900fff4e42de4c7d64b61cc/src/realm/object-store/sync/sync_manager.cpp#L179-L182