Resolution: Awaiting Response
Affects Version/s: 1.16.100
Fix Version/s: None
An anvil on a Pisten pushing upwards with a Redstone clock causes the anvil to glitch out and go all over the place, even inside the extended piston arm.
How to do it in steps
Step 1: Make a Redstone clock with 2 repeaters on 1 tick facing into a block going into a square loop. Then from there, you make 4 repeaters go straight from one of the blocks feeding into a regular piston facing upwards.
Step 2: ad the anvil on top of the face of the piston
Step 3: Ad a lever and quickly flip and un flip it to cause 1 Redstone tick signal to go into the Redstone clock feeding into the piston.
There is a gif of it happening in action in the attachment below.