Previous AsyncOS versions you would get an error if you tried to exceed 32 content dictionaries. It appears the new AsyncOS doesn't give that error when you go above 32 dictionaries. I think 32 dictionaries was implemented as a good number of dictionaries for performance reasons for the AsyncOS.

With 77 content dictionaries we exceed the total of 32 (Userguide 6.4.0, p.360)

Thought this is hardcoded in the AsyncOS?