The bug
A spider accidentally fly while it was trying to climbing, it stopped fly when hit but climbed again. See
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Is this still an issue in 19w12b?
Still an issue in 19w13a, see https://www.youtube.com/watch?v=Mry6ADKhOmo.

Occured for my friend and I on 19w14b on multiplayer.

Cannot reproduce the issue. Could someone provide me with an reproducible scenario?