Build Pipeline - Checkout submodules stopped working

We have a number of build pipelines that have been working for months without issue.  Most of our Git projects rely on submodules.  The checkout of submodules stopped working yesterday.  This was working fine the day before.

Trying to understand what could have changed that would cause this to stop working randomly.  I have checked  various settings and as far as I can tell nothing has changed.

Any suggestions on ways to troubleshoot this would be very helpful.  This issue is preventing us from shipping code and needs to be resolved.