Firewall is blocking Screen Sharing

I have a Mac mini (2018) and a M1 MacBook Pro (13 Inch, 2020), both running on Monterey 12.2.1. Both have Firewall turned on, and both have "Allow Incoming Connections" enabled.

I use Screen Sharing a lot in my home. The connection from my MacBook to the Mini works fine, but when I click on "Network: MacBook Pro" from my Mini, File Sharing works fine and I have access, but when I try Screen Sharing, I get the following error:

If I turn Firewall Off on the MacBook, then Screen Sharing works fine. Why does it work one way (MacBook to Mini) and not the other way around??