The Achievement Thumbnails & Character Creator Reward Thumbnails disappear after Tabbing Out & Back Into the game

The Achievement Thumbnails & Character Creator Reward Thumbnails, disappear after Tabbing Out & Back Into the game.

How to reproduce:

1. Go to the Achievements Screen
2. Observe the Achievement & Character Creator Thumbnails
3. Go back to the Main Menu
4. Tab out & back into the game
5. Go back to the Achievements Screen
6. Observe the Achievement & Character Creator Thumbnails not appearing on screen

Observed Results: The Achievement & Character Creator Thumbnails disappear after Tabbing Out & Back Into the game.

Expected Results: The Achievement & Character Creator Thumbnails should not disappear after Tabbing Out & Back Into the game.

Note: The Loading Spinner is also affected, but that is already covered here MCPE-113758

This report is covering the Achievement & Character Creator Thumbnails.