Can't add keyframes in animation editor of a custom rig after leaving it for 1 day

So I was animating a custom rig, I was finish, I saved it and the next day when I opened studio and opened the animation. It didn’t have any keyframes in it, but when I played the animation, the rig still played it without it showing any keyframes. I couldn’t edit the keyframes and I couldn’t add ones either. This is what it looks like when it glitched: image

Yesterday I could just click Add all or add spine and I could just edit it. But now when i click any of them, it won’t do anything. Does anyone have an idea how to fix this?

Ok so apparently if I add a humanoidrootpart and weld it to the custom rig, this happens. When I removed the humanoidrootpart it worked again