For me the hotbar bugs out when you minimize the game while it is loading into a server. Also seems to affect the blood splatter effect from bleeding - it stays on the screen until you rejoin/restart.

I've had the hotbar vanish on me too, and the "~" key doesn't bring it back. When that happens if you go into options and set HUD to disabled, then enabled again, and save it comes back.

In T178308#2555026, @SirWyrd wrote:

I've had the hotbar vanish on me too, and the "~" key doesn't bring it back. When that happens if you go into options and set HUD to disabled, then enabled again, and save it comes back.

well good to know but that cant be the solution obviously

having the same thing, i was hoping to pinpoint some mods causing that, but seems like it's either very inconsistent or vanilla bug

In T178308#2555483, @cdatakill wrote:

having the same thing, i was hoping to pinpoint some mods causing that, but seems like it's either very inconsistent or vanilla bug

oh trust me for me it is very consistent and super annoying as it happens every second time i "do" one of the things mentioned

In T178308#2555026, @SirWyrd wrote:

I've had the hotbar vanish on me too, and the "~" key doesn't bring it back. When that happens if you go into options and set HUD to disabled, then enabled again, and save it comes back.

Same here.

Actually, I even made some edits to update the player’s hud, but it’s still there periodically (that’s what people say)

The problem with the hotbar is definitely over a year old, strange that it has only now reached BI. It can probably be found on moddet servers and vanilla servers alike.