The VM crashes on platforms with 64kB pages (MacOS aarch64, PPC64):
java -XX:GCCardSizeInBytes=128 -Xmx8m -XX:+UseShenandoahGC -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCMode=generational -version

shenandoahScanRemembered.cpp:865
assert(smallest_chunk_size_words() << (_maximum_groups - 1) == _maximum_chunk_size_words) failed: Maximum number of groups needs to span maximum chunk size to smallest chunk size