Affects Version/s: 1.15 Pre-release 4
Fix Version/s: None
When you're in a dimension (Nether or End) and you're teleported by a command block in the overworld, you won't see your experience bar filled anymore. Your levels aren't displayed neither. You need to deconnect/reconnect (or quit/join the world again in single player) to display them again.
How to reproduce
1. Set a Command Block on "Repeat / Always active" mode on the chunk of the spawnpoint of the overworld, when fill it with this command :
2. Create a Nether portal and go to the Nether.
3. Give yourself some xp points and a potion that will apply the effect needed to be teleported back :
4. Drink the potion to be teleported.
Obviously, there's no screenshot I can sent to you.