This Ubuntu bug is remotely related: https://bugs.launchpad.net/ubuntu/+source/apt/+bug/1760810
The suggestion there is to use a different resolver in the fallback (that would probably have prevented the current case of the issue, but not the general problem I guess). Quote: ''' Julian Andres Klode (juliank) wrote on 2018-04-03: #3 sbuild passes: --solver aspcud -o APT::Solver::Strict-Pinning=false -o 'APT::Solver::aspcud::Preferences=-removed,-changed,-new,+sum(solution,apt-pin)' That probably works here too. I guess I'd try without, and then fall back to it if pure APT can't handle it. '''
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