To mitigate it, bluca added a piuparts check which rejects packages that move files from / to /usr (for bookworm/sid). This is overly conservative as strictly speaking, we'd only have to be careful of packages that move files from / to /usr and between packages within one release cycle. I.e. it would be perfectly fine to move files for / to /usr if during a release cycle those files aren't moved between packages. I suspect this will be a rare case, that said definitely something to be aware of if we don't get a fixed dpkg.
Fwiw, once all files are moved to /usr, the dpkg bug is no longer really relevant.
So, I think there isn't any new information here in #1020792 which would warrant a halt.
Regards, Michael
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