Insta-kill bug

[Red-Pumpkin20]

Describe the issue
I found a very peculiar yet dangerous bug while messing with the Kinetic Damage option in the server settings. When set to Insta-kill if the player does hit a wall the game soft locks into a weird state of being alive yet dead at the same time. The players has zero hearts and can't die to anything, including /kill and void damage. I couldn't find a way to fix this issue so I ended up just replacing the player data file and rolling my character back before this happened.
In this half dead half alive state I couldn't open any guis (inventory, chests, villagers etc) and couldn't go through portals. I also couldn't pick up items though I could throw the items from my hotbar on the ground

Crash report/logs (if applicable)

Additional information
I play on version 1.21 in a single player world that was started in version 1.19. I think this is important because I couldn't replicate the issue in a freshly generated 1.21 world. In the screenshot attached me and my friend are both experiencing this bug and as can be seen in my hud I have no hearts.