СSo i was playing on my test (flat) world on my phone (Xiaomi Redmi 7) put a sticky piston on top of bedrock level and when i tried to pull the block it stayed in its position not being able to pull it back. I created an other world and it happened there too. Now this only works when the piston is facing upwards and it does not work if you just place it on bedrock without the bedrock being on bedrock level. I have also sent a short video showing the bug (i don't talk in it)