https://i.imgur.com/YSReDo7.png
This has happened so many times over the past year.
I have yet to find any media coverage of this or any explanation but it happens so often.
last week it happened on Friday too, Bitcoin suddenly plunged 5% from $71k to $69k:
https://imgur.com/gL94YWH
I think this is the last stage. buyers completely exhausted and funds dumping.