also, we have strange issue with spicedb cache: our spicedb app was heavily loaded (70%+ CPU). we had two parallel write requests. they returned zedTokens and we cached the last one (it was from second request). then we made check relationship request to validate relationship from first request and used "at least as fresh" level with this cached token (from second request), but got FALSE response. for some reason, the snapshot after second request doesn't include the changes from the first one (first one was complete earlier). when we do the same check request but with level "at exact snapshot" and with the same second token we get FALSE response too, if we use token from first request - we get TRUE response