Blender 3.0 - making the mesh symmetrical in mesh > symmetrize causes the mesh to change its base state into half of what it should be

[jl1011]

It's kinda hard to describe what I'm saying but:

The mesh works fine with the addon. But I want to make it more symmetrical because a few verts are off, so I go up to mesh > symmetrize to make it perfect. It looks good! Except now when I click reset, this happens:

I mean I know I probably shouldn't be messing with the cloth after making the pattern, but it's really common to need to edit it so I may just be skipping something. I don't have a cache I don't think and I'm not doing the animation version, just continuous mode

[jl1011]

Edit: OK, so I managed to fix it by reverting it back to the symmetrical state, and then clearing all shape keys, and then re-pressing the cloth button in the N panel. Guess that's not too hard :)