The PlayerRevive mod adds a "bleeding out" state after a player has lost all health, where the player can be revived by another player.

When a player is in the "bleeding out" state then exit the game for any reason, Totem of Holding will not spawn.
So all items in their inventory will be lost forever.

Minecraft 1.18.2
Quark 3.2-358
Quark Oddities 1.18
PlayerRevive 2.0.1

I have also opened an issue at PlayerRevive's github here
CreativeMD/PlayerRevive#92

PlayerRevive will kill the player on disconnect, to prevent players from existing the game to increase the time for the others to find and revive them. Seems like this causes this issue here.