How can I invert an ACR subject mask without losing edits to the mask?

I am using the latest Adobe Camera RAW version on a Windows 11 laptop.

I just spent a lot of time fixing an ACR subject mask and then spent a lot more time editing the subject. I then wanted to selectively edit everything except the subject, however, when I inverted the subject mask with the tweaks applied, the tweaks disappeared.  I of course had a snapshot, so I didn't lose any changes, however, this is not the core issue.

Creating a separate non-subject mask should not be necessary, and in this case, it ended up masking some of the subject anyway.

So, the obvious question is - once I've finished editing a masked ACR subject, how can I simply and quickly selectively edit everything except the subject, without of course losing the subject edits in the process?