Does error mitigation work with non-diagonal/multi-term observables?

[BrunoLiegiBastonLiegi]

I was having some problems with error mitigation and I just noticed that the error_sensitive_circuit method only considers the firs term of the observable here:

qibo/src/qibo/models/error_mitigation.py

Line 1033 in 01f1342

terms = observable.terms[0].factors

is this expected?
What happens if I have a multi term hamiltonian or a non diagonal one, are our methods expected to work?
@AlejandroSopena maybe you can help me out here.