In Oasis I saw a dune tarantula walking way up high, around 2063,415. Various orcs floating, then falling down, then teleporting back up, then walking a couple of steps then falling, ad nauseaum. Around 2102,1130. Once the mob was past the general area they would resume normal movement.
Attached screenshot shows spider high AF and orc in process of falling down.
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Not sure if Green bug specifically.