If a glass pane is on top of a slime block which is on top of an upwards-facing piston, when standing on the slime block (glass pane is connected to others) while the piston extends, you only get pushed up on block, instead of flying up.
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This is working by design, the glass pane snaps into it's cross form if no other glass panes are besides it in extended place, and the player stands inside the cross formed glass pane.
If there are other glass panes in the upper position the bouncing will work as usual (screenshots 2 ..4)
Unfortunately, as my screenshots show, my setup doesn't really allow more glass panes as they won't be pulled back down without extra pistons.
Can confirm – but (small suggestion) maybe the title can describe more the bug's concrete effects (messes up bouncing), rather than its abstract effects (messes up mechanisms)