The bug
Downward bubble column generated by magma blocks do not work on spiders and cave spiders. Spiders are able to hover/climb and maintain a neutral bouyancy, and such resist the bubble column. Upward soulsand columns work fine.
This issue is more difficult to reproduce for regular spiders than it is for cave spiders.
Linked issues
is duplicated by 1
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Comments 4
As I mentioned in my comment, cave spiders can maintain bouyancy even when they can't touch the sides. At the same time, a regular spider in a 2x2 tube, which is in full contact with the sides is pulled down by the blocks.
Was able to get this to happen with regular spiders as well, but only once. Seems to be more difficult to reproduce for those.
Is it not only because you give them a wall to grab onto?