cloneDeep not cloning nested Map

[amdeenmsft]

I have this object
{ contentMap: Map<string, string>} .

I use cloneDeep to clone the object, then try to update the contentMap.
I get this Immer exception: Error: [Immer] This object has been frozen and should not be mutated when doing:

clonedComponent.contentMap.set({...})

I have determined that the cloned object's contentMap is still referencing the original, and I have to declare a new content map and manually set it on the cloned object. The docs suggest this should be supported behavior, so there seems to be a bug