Updated Docker to 6.0.41 and a cloud key. No issues.
Just wanted to add that I have just upgraded a self-hosted controller from 5.12.72 to 6.0.41.
Have not seen any issues yet.
The upgrade did resolve an issue attempting to adopt a new USW-Lite-8-Poe running FW: 5.6.0.11463.
Initially this switch would not show up in the controller after setting the Inform URL.
After updating the controller to 6.0.41, this switch appeared immediately and was able to adopt and upgrade the FW on the device (currently now 5.43.18.12487).
All is well.