We have been investigating the error and we suspect that it is related to 
the issue
#7970 <https://github.com/dealii/dealii/issues/7970>
that has been assigned to the milestone "Release 9.2".

In particular I think that it is due to the missing implementation of 
get_face_sign_change_rt for 3D triangulations
(see 
https://github.com/dealii/dealii/blob/master/source/fe/fe_poly_tensor.cc#L111
).

We will be thinking of a solution to that function, do you have any ideas 
or suggestions to start from?

Thanks.

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