1.21.10 server crash

[Imorby]

When i put in "command when leave" in config "execute as {player} run function [my function]" it crashes server when combat logged

I've already created workaround with granting an advancement wich activates the function and it works but issue is kinda weird

Also is it possible to block not an elytra entirely but elytra firework boost when in combat?
I mean it as a suggestion, idk how to write mods, ik only basics of datapacks.

[WildToastyMop]

could be due to the time that you can actually interact with the player since when they disconnect you only have a few ticks until they are fully disconnected and then cannot run commands that target them, I will look into the firework thing should be easy enough