[Add-ons] The "other" subject in filters when an entity spawns won't always work

I was making an add-on, and I wanted to make it so that when a player spawns a shulker (using a spawn egg) it will have a certain component group, and when it isn't a player (like if it's summoned either naturally in an end city or using the /summon command) it would have another component group. The first part where if it were a player that spawned it worked and it did spawn with the component group I wanted, but the second part didn't work, as in when it would spawn naturally in an end city or through the /summon command, it would just spawn with I think default where there weren't any component groups and it had just the default components.