I don't quite know how old this bug is but I stumbled across it when using command block minecarts to make a little contraption.

Essentially, I put a command into a few command block minecarts on activator rails (They were turned on) and then left the world for a break. I then joined back and the contraption wouldn't work. I checked the Minecarts and one's command had been cleared and the other had its name and command cleared.

I use a laptop with Windows 10. The name is "Lenovo ideapad 100". I'm running the current release of Minecraft Bedrock. Experimental Features were not enabled.