While executing the SalesForce test script I executed the following query:
Select Name, Communication_Preferences_c from Contact where true = includes(Communication_Preferences_c, 'Fax,Email')

Other queries do succeed, but the exclude function suffers a similar fate.

The response was: Function includes is marked in the function metadata as a function that must be evaluated at the source.

Looking at the functions in the Designer, the PUSH DOWN property has a value of REQUIRED.

Am attaching the server log excerpt and Model Project Set