I'm having a keystroke delay seens the 1.16 bedrock windows 10 edition update. When i tried to open a inventory in LAN worlds, Realms or Server, it have delay opening depending in your internet connection or host's internet performance. Also keystrokes/movement delay when the LAN world is lagging or have many players or NPCs, yeah it depends on the LAN world. if the world have lot players or NPC, my gameplay will start to face keystroke and movement delay. (it's estimated atleast 15-20 players in the LAN World)

I try to downgrade to 1.14.60 and and joined in LAN world and Servers and didnt face any issue that i mention above
So that means its on 1.16. Hope you fix it guys !

Issues:
• Movement/Keystroke delay when the LAN world's host is lagging
• Inventory delay in LAN worlds, Realms and Server depending in your internet connection or Host's internet connection.