Is there a maximum number of application domains

I have a few services that I want to lock behind application access rules. I can set up to 5 subdomains/domains in the application rules, but no more. I could make individual rules for each application, but it would be much simpler to maintain them all in one place. I looked through the docs and didn’t see anything about a maximum, so I’m wondering if this is intentional or not, or if I’m somehow configuring something wrong.