Command block text disappearing

Hi, I'm reporting this bug because I have a realm using command blocks but the text in the commands disappears once I type something in it.

Once i click on the command block again it resets everything 

This glitch ONLY happens on realms for some reason since it didn't do it when I tested it on a world

Steps to Reproduce:

1. Create and join a Realm
2. Place and open a command block
3. Type any text in the command block
4. Close and reopen the command block

Observed Results:
The text disappears.

Expected Results:
The text should not disappear.