Time Machine Snapshots - One of these is not like the rest.

I have noticed this snapshot at the end of the list. Any idea what it's for ?

tmutil listlocalsnapshots /

Snapshots for disk /:

com.apple.TimeMachine.2020-12-30-110717.local

com.apple.TimeMachine.2020-12-30-130337.local

com.apple.TimeMachine.2020-12-30-150547.local

com.apple.TimeMachine.2020-12-30-170306.local

com.apple.TimeMachine.2020-12-30-191913.local

com.apple.TimeMachine.2020-12-30-202913.local

com.apple.TimeMachine.2020-12-30-213343.local

com.apple.TimeMachine.2020-12-31-095832.local

com.apple.asr.1015