Why would a part of the parent component in the component variant suddenly disappear, causing all the auto-layout cards carrying child components to deform and shift out of place?

I didn't make any changes to this variant, but it suddenly turned out like this. Currently, I can only solve this problem by reverting to the previous version, but this is too troublesome and it's not the first time it has happened. Please reply to me as soon as possible. Thank you!