Unable to migrate even just storage on same host due to EVC CPU "hardware requirements" but all hosts & guests have same EVC Mode version "Cascade Lake"

I have a vSphere 7 cluster all using "Cascade Lake" CPUs running in "Cascade Lake" EVC mode (both guests and hosts) and I am unable to live migrate due to:

> The target host does not support the virtual machine's current hardware requirements. Use a cluster with Enhanced vMotion Compatibility (EVC) enabled to create a uniform set of CPU features across the cluster, or use per-VM EVC for a consistent set of CPU features for a virtual machine and allow the virtual machine to be moved to a host capable of supporting that set of CPU features. See KB article 1003212 for cluster EVC information. Microarchitectural Data clear is unsupported. FCMD is unsupported. Speculative Store Bypass Disable is unsupported. Single Thread Indirect Branch Predictor is unsupported. Indirect Branch Restricted Speculation is unsupported. Indirect Branch Prediction Barrier is unsupported.

Confusingly I have not updated vSphere or my hardware in a while and this seems to have just started.

Update: I just turned EVC off - no point troubleshooting when I know there are no incompatibilities. Migrations are working fine.