Healing brush and clone stamp source points not moving/not following brush

I just updated to Photoshop 21.2.2, and the healing brush and clone stamp are no longer working as expected.  After I select the initial source point, the source point for the tool is no longer following the brush; the initial source point remains fixed.  It *seems* that this is a visual bug only - the tool is actually moving the source point as I paint, but that missing visual indication of what I'm actually sourcing is really messing with my ability to control the tool.

Any help on this?  Gotta say I'm pretty steamed with this release.  I spent an hour trying to figure out why my brushes no longer responded to pen pressure (short answer: now Adobe *does* want to use Windows Ink) only to discover that the two most important tools for retouching no longer work.