The functions fail silently without any error message.
I just get back the input.
In[257]:= PersonData[Entity["Person", "BillGates::55r7v"], "BirthDate"]
Out[257]= PersonData[
Entity["Person", "BillGates::55r7v"], "BirthDate"]
In[251]:= MovieData[
Entity["Movie", "Avatar::y6ws3"], "ProductionBudgetAdjusted"]
Out[251]= MovieData[
Entity["Movie", "Avatar::y6ws3"], "ProductionBudgetAdjusted"]
In[254]:= MovieData["SampleEntities"]
Out[254]= MovieData["SampleEntities"]
In[258]:= CommonName[Entity["Country", "UnitedStates"]]
Out[258]= CommonName[Entity["Country", "UnitedStates"]]