Syncro/Quickbooks not syncing refunds

I refunded an item in Syncro and created it as a store credit. This generated a refund invoice. The refund invoice did not sync to QB, even after re-syncing so the credit does not show in QB.

I then applied the store credit to another invoice. It also did not sync with QB. So, QB is showing they have a full bill to pay.

Why are these not syncing?

Please see the docs about the limitations of refunds and store credits.