Issue present in 0.3.12 and 0.3.13, singleplayer and multiplayer. Pistons and sticky pistons won't extend when there are slime blocks or honey blocks in front of them. Sticky pistons won't pull slime or honey blocks back when retracted. Have ensured only air blocks are surrounding the sides of the blocks to push/pull in screenshot, did some testing with obsidian as well.

Pistons appear to interact with regular blocks (i.e. glass) as usual.

I confirm, this bug persists at version 0.3.20.

I confirm as well, this bug persists in version 0.3.21

Traced to UtilitiX

ChaoticTrials/UtilitiX#23

Fixed in 0.4.5, thanks.

Still exists in 0.4.3