Draft: Invalidate ring view more often, fixing assertion failures

Simon McVittierequested to merge
wip/bug1040049-bookworm into debian/bookworm

Closes: #1040049

As discussed on !7 (merged), this needs more testing before we propose it for bookworm-pu. @bluca is testing a version of this from https://people.debian.org/~smcv/12.2/.

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