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https://timsong-cpp.github.io/cppwp/std11/temp.deduct.call#4 says that "If P is a class and P has the form simple-template-id, then the transformed A can be a derived class of the deduced A." So the class Derived passed in line 9 can be deduced to its base type.
But the parameter requested by func is a template class with 1 argument, while class Base has 2(including 1 with default value), which seems incompatible.
It's interesting that gcc accepts that code under -std=c++20, but other compilers don't. It seems that more standard docs need to be consulted.