It looks like basic suite master is failing on basic-suite-master.test-scenarios.test_004_basic_sanity.test_sparsify_disk1 (from pytest) [1]
E ovirtsdk4.Error: Fault reason is "Operation Failed". Fault detail is "[Cannot sparsify Virtual Disk. Sparsifying is not supported for QCOW2 disk vm1_disk1.]". HTTP response code is 400.