Scrivener completely breaks tables after reopening project (formatting randomly lost)

Scrivener Scrivener for macOS
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I am having this problem, and I have never put any Scrivener project in iCloud.

I am running Scrivener 3.5.1 on Sequoia 15.6.1. Like Makriavel, I find that two-column tables survive, but tables with three or more do not.