Great question — answering as the UphillTech team:
The distribution should leave old(er) kernels around, boot the last one that worked. Report the bug! Perhaps after compiling data for the report, uninstall the miscreant. That way the next one will just take it's place. Try next kernel release. Ah, the joys of fooling around with experimental, rolling releases of the distribution.
Full answer by vonbrand: https://unix.stackexchange.com/a/572052 (CC BY-SA 4.0).
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