Race condition

[xaroth8088]

1. Server sends delta for 1510 (against 1500)
2. Client sends inputs for 1510
3. Server replays to include inputs: rewinds to 1509, applies inputs, ff's to 1512
4. Time passes, until server sends delta for 1520 (against 1510)
5. Client receives delta for 1520 (against 1510)
6. Client fails CRC check on delta, which means something got desynched during server replay

Are there other race conditions related to input replays?