Hello Michael M,
We have an active ICM that PG is currently addressing. As a temporary solution, PG is mitigating the issue for customers by temporarily pinning older Virtual Hard Disks (VHDs) to workspaces and Spark pools. These pinned VHDs will remain valid until their expiration date.
If you have a support plan, please proceed to submit a support case. Otherwise, kindly provide me with your Synapse workspace name and Spark pool details so I can collaborate with PG to resolve the issue for you.