This is not a bug, it is a real feature to enable cheats no matter hardcore or vanilla. You are requesting a feature of no activate cheats in hardcore. Please do that on MC suggestions website!
this is terrain generation acting weird, it is uncommon. It cannot be reproduced therefore not really a bug. the developers are probably unable to fix this.
Not a bug, Hit f3 sometimes shift and f3 and the nether portal blocks have a tag that says something around "Hoglin repellents" meaning hoglins will not pathfind to them. Same with piglins.
We cannot confirm if this is a real bug because how do we reproduce?
I can confirm, the back of paintings also uses the old wood texture.
This is sort of not a bug, if you kill the ender dragon and the ender dragon is above an obsidian pillar it will not start disappearing until it reaches the bedrock portal. This is most likely intended.
This is not a bug it is intended
Has not been fixed in 1.16.3, hopefully they fix in 1.16.4 which has been announced
Confirmed as a bug in latest version.
This did happen to me actually about a month ago. This is most likely a bug.
Tested this, can confirm as a bug for latest version.
I assume this is not a bug. Slimes and Magma cubes do not actually jump; they bounce up and down sort of like a player bouncing on a slime block.
This is an intended feature. The doMobspawning gamerule controls when the game tries to run the mob spawning algorithm and attempts spawn a mob, and setting the gamemode to false prevents the mob spawning algorithm. Spawners have nothing to do with the algorithm.
Very easy solution. You have your maximum framerate setting to the lowest of 10 fps. Turn it up all the way to max.
I feel bad for you if you bought the computer just because of this lol
Alright, sure will do that.
1.16.3 fixed 2 bugs nothing related to this, and I mentioned when it happened in a vanilla world with no mods and datapacks in the latest version.
This has happened to me, you need to go to task manager and end task the launcher.