I think in the latest additions to adaptive antialiasing some code got misplaced and now AA samples option is disabled in SSPM, it should be enabled, the only thing it should be dissabled is the number of passes since it is handled in the SSPM panel. Now if I want to change AA samples for each SSPM pass I have to enable another integrator method, change this setting and enabling SSPM again. I have found this in the compilation you have prepared with the fix about the SSPM photons counter, but I think this bug happens in the "official" 3.1.1 version as well. Please confirm this is a bug. Greetings.
PD: at the moment only AA samples is needed but it is possible that I make a feature request about enabling some features we have currently implemented in adaptive sampling for SSPM passes as well.