When I go AFK in Hypixel and then leave the server while still AFK, the message disappears (As expected). When going on to a completely different server network (Performium), the message reappears as shown here:
[media]
Update:
When I go back to Hypixel, the message disappears and does not appear on Performium either.
Environment
Running Minecraft Java Edition 1.16.4 on MacOs Catalina 10.15.5 with 8GB of ram with Java 8 Update 271.
Duplicate of MC-55347, but keep in mind any issues with external modified servers must be taken up with them