Custom Entity Addon Crashes Game

I'm still new to making addons as I've just downloaded Minecraft Windows on my launcher as of Summer 2022. And despite looking over every tutorial, article, or thread I could find on the topic, my addon keeps crashing the game whenever I try to spawn/summon a custom entity.

I noticed the issue might lie in my <name>.entity.json file in the resource pack (I'm using a resource and behavior pack). When I change "minecraft:client_entity" to "minecraft:entity", everything works fine, except that I can't see my entity's model nor texture.
I've attached the pack zip files below to replicate the issue.