Realms Box on World Selection Screen appears blank instead of showing 'Fetching Realms'

On the World Selection Screen (as I call it), the Realm box appears blank (from what has happened, it only happens if you own a Realm)

Steps to Reproduce:

1. Load Minecraft
2. Click play
3. Notice that the Realms box sometimes appears blank

Expected Result:

It loads fine.

Update: This happened before 1.21.20, so this shouldn't be resolved as a Duplicate of MCPE-185254. Instead, the blank box replaces the 'Fetching Realms' loading screen.

Sometimes, the blank box replaces half of the Fetching Realms screen.