Since v6.42rc39 (7 March 2018) it's possible to configure via CLI an Interface List for an Access List.
But if I configure this, the Clients get rejected. So this is not working imho.
Can anybody confirm?

I'm on leatest stable and have the same problem. After changing from interface to list that have included cap interface client has been rejected, forbidden by access list.
What's od Prosper way to configure this?

You are right.

altough 6.44 changelog says

*) winbox - allow specifying interface lists in "CAPsMAN/Access List" menu;

it is still not working.

Anyone get it working?

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Had the same issue but seems to be working with the latest release.