When I reopen Minecraft I can’t enter to any server until I restart Minecraft completely

When I am on any server, and I need to close Minecraft for a moment, I need to restart it or I can’t enter until I restart minecraft. For example: I am playing CubeCraft (My favorite server), but for some reason I have to close Minecraft for a moment, but when I enter again, I can’t get on any server because it never loads the resource packs (that’s the message the game returned); that screen never end. Here is the video: me closing Minecraft for a moment and enter on it again and trying to access a server:

 

To reproduce:

  **    1. Open Minecraft Bedrock.

    2. Enter any server.
    3. Put Minecraft in background tasks (close the game on background without restarting)

    4. Open Minecraft again.

    5. Try to enter a server again.

    6. You reproduced the bug. That screen NEVER ends