Strange Authorizer behaviour

When I checked my Authorizer (I'm using ParametricBuilder), I found out it executes 2 times. Firstly for the first command in class (with annotated methods) then for my current command. If the 1st cmd in class has no Require annotation the Authorizer won't be executed 2 times (only for the current cmd). It doesn't affect on cmd execution (cmd executes once correctly), but I think it shouldn't be so.