The changed message still carries the old tag from the original bytes.
The attacker changes the message
The original amount 10 becomes 90. The old tag is still 0xd622.
Changed bytes
The changed message bytes are 0x7061793d3930.
changed message=0x7061793d3930
Old tag is not recomputed
The attack keeps the old tag beside the changed message. That mismatch is what the receiver checks.
old tag=0xd622
Summary
Changing authenticated bytes without changing the tag creates a check failure.
changed bytes=1