Why is /etc/ in /run/user/1000 sandbox?

Was trying to add the /etc folder to my Pika backups and wasn’t able to because /etc is running inside the /run/user/1000 sandbox. I assume that’s because of a flatpak using a folder in /etc but before I start trying to figure out what’s really going on I have to ask, is this a normal function of bazzite? Or is something misconfigured? Or shoul I start uninstalling flatpaks?
Thanks