I've noticed that several times, since the trading rules for showing lot size started. After that new rule, many MMs don't show accurate quotes until 30 seconds or so into the trading day.
I've seen it on a .0000 POS with 9 billion OS. One morning a .0004 was painted. The prior trading day ended with millions of .0002s on ask, and just after the .0004 was painted, the millions of .0002s loaded back on the ask. It gives the pumpers something to pump.
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