There is a desync between the expected existence of the mob and its removal as a projectile.

Hi, I'm using a projectile mechanic consisting of a knife thrown to the target (Or forward in general) and I've noticed that sometimes this error appears in console: https://pastebin.com/zRdfR6EA

(Note: The skill itself works fine, the only thing is that I get this error repeated almost every time I execute it. It appears the moment when the projectile collides either with a block or an entity.)

The projectile is an armor stand with the item in its head: https://pastebin.com/KcD0TJ7A

And here is the projectile mechanic: https://pastebin.com/ZURUNn6A

...With the skills contained in it: https://pastebin.com/YAsx9YZn

I'm currently using mythicmobs build: 26e7dee2 (MC version: 1.17.1) when I tried the skill I used either the onUse trigger from Crucible or directly an mmoitem