Importing a VRM models create these weird planes once in a while. They can disappear and reappear at any time, but they usually pop up when posing. Trying to delete the plane also deletes the body.
Steps to reproduce the behavior:
Import a VRM model into Blender (in my case, I used a model from VRoid)
If it doesn't appear right away, pose the model (you may have to move many bones for it to appear)
Importing a VRM models create these weird planes once in a while. They can disappear and reappear at any time, but they usually pop up when posing. Trying to delete the plane also deletes the body.
Steps to reproduce the behavior: