The icons for chemical compounds I created doesn’t show up after I exit Minecraft by using the app switcher or pressing home, but if I click on the space the name pops up normally. To recreate this, just create a compound, then exit Minecraft by pressing home or using the app switcher, and then press on Minecraft again. I have Education Edition activated on Bedrock Edition and experimental gameplay is also activated. To fix this, save the world and rejoin it.

Link to video showing proof and how to recreate it: https://www.youtube.com/watch?v=p38HunRfPrE