I recent Tesla Daily video from Rob M explained Tesla account for shares on the 21st and brokers track them afterwards.
When a short has borrowed a share, that borrowed share gets the dividend .. so no real problem..
But i think Dodgers is on to something here in naked shorts, no share is borrowed so no dividend is coming.
If the share price is 1/5 after the split perhaps those naked shorts can pick up the required shares in time.. they always needed to buy 1 now they need to buy 5.
The big danger for shorts of all kinds is the share price being higher than 1/5 after the split.
So part of the current rally is covering. I do think Dodger is on to something ....
I guess really what counts is the naked short position at particular firms at this time, if they have a pattern of behavior where they are peak short at this stage of the cycle they might get caught out...
Options closing dates might be part of the jigsaw..