@Override
	public AddressSet subtract(AddressSetView addrSet) {
		ensureKnown(minAddress, maxAddress); // Whoa
		return cache.subtract(addrSet);
	}
{@inheritDoc}

After this method is executed, the entire delegate is loaded into the cache.
Ghidra/Debug/ProposedUtils/src/main/java/ghidra/program/model/address/CachedAddressSetView.java