Vexes with the tag {Invulnerable:1b} disappear completely as if they don't exist (Datapacks)

When summoning in a vex with the the tag

{Invulnerable:1b}

the vex disappears as if it never existed, this never happened before because I was using this tag on vexes for a datapack I made and it worked just fine.

Seems to only happen while a datapack is active tho, specifically ones that make use of vexes with this tag