What's the expected behavior after adding an extension?

[GrahamBells]

I'm testing how to use your dynamic contracts standard by deploying the MarketplaceV3 pre-built contract. When I add an extension based on a deployed Token contract, the functions are added in the Explorer which I assume is the expected behavior.

Then I forked MarketplaceV3 and removed unneeded extensions like the Royalty and Platform fees extension. But I don't get the same behavior after adding an extension, it doesn't show up in the Explorer. Is this expected or am I missing something?