@Override
	public AddressRangeIterator getDefaultRegisterValueAddressRanges(Register register) {
		RegisterValueStore store = defaultRegisterValueMap.get(register.getBaseRegister());
		if (store == null || store.isEmpty()) {
			return new EmptyAddressRangeIterator();
		}
		return new RegisterAddressRangeIterator(register, store.getAddressRangeIterator(),
			defaultRegisterValueMap);
	}
if the address is in an overlay and we are getting the default value, then get the default
value from the base space, not the overlay space.
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/util/AbstractStoredProgramContext.java