The bug:
If the info which gamemode you were in when you last entered a worldsave is not available/lost, upon entering this world and trying to switch gamemode with F3+N, the error is shown in chat: "Unknown command /gamemode<--HERE]"
As soon as you changed the gamemode via typing it into the chat, e.g. /gamemode survival, switching with F3+N is possible again.
This bug occurred when I entered an old worldsave with 1.16.2 release in which I haven't been since 1.14.2 release.
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This report is a Duplicate of MC-193120, which has been marked as Won't Fix - while this behaviour is not desirable, the developers have said that they will not or cannot fix it.
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