Whilst playing Minecraft on Windows 10 connected to a Minecraft Realm (Currently a Trial realm) and running as "fullscreen". When I use Alt+Tab to use a different monitor/access a different window I find that upon my return to Minecraft there appears to be a desync between myself and the server which ultimately disconnects me from the realm. This happens frequently and on every attempt using my hardware.

Notes on Setup:
Currently running 3 monitors with Minecraft on the central monitor.

Steps to Replicate:

1. Launch Minecraft
2. Connect to an active Realm
3. Ensure realm is working as expected
4. Alt Tab to use a different screen/window
5. --> e.g. a web browser to check Minecraft wiki
6. Alt Tab back to Minecraft
7. Continue to play
8. --> User may notice that chests fail to open/populat
9. Game disconnects

Expected:

• Server to remain connected and activities to continue running whilst user has Alt+Tab