When using “Toggle crouch” (in-game setting “Sneak: Toggle”) on 1.21.9 if the player crouches and open the inventory the player model is no longer crouched, making it so if the player is crouched on vines or a ladder, the player model will slide down them, but as soon as the player closes the inventory screen, player return to crouching.
Tested in 1.21.8 to make sure, and when I repeated those actions on a ladder- climbing up it half way, crouching, then opening the inventory- the player model stayed where it had been.
But when trying again in 1.21.9 after reloading the game, opening the inventory forced the player model out of crouching, and sent it sliding down the ladder.
Linked issues
Comments 2
Duplicate of MC-301806 which is working as intended.
That's how it works, it was a bug, then they patchedd it on 1.21.6 but if you are asking for an un-patch of the bug you can make a suggestion on the official Minecraft Feedback website (https://feedback.minecraft.net/hc/en-us)