I encountered this while running make check on #21800 locally (stock x86_64 host w/ Ubuntu 20.04, nothing special). Making a separate issue because I don't think it's related to the changes there:
./test/blockfilter_index_tests.cpp(140): fatal error: in "blockfilter_index_tests/blockfilter_index_initial_sync": critical check time_start + timeout_ms > GetTimeMillis() has failed
pure virtual method called
terminate called without an active exception
I cannot reproduce it.