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I confirm the bug in SageMath 9.7, but it has been corrected in SageMath 9.8:

sage: E.<e1,e2,e3> = ExteriorAlgebra(SR)
sage: e1.interior_product(e1)
1
sage: (e1.interior_product(e1)).constant_coefficient()
1

So the solution is to install SageMath 9.8.

I confirm the bug in SageMath 9.7, but it has been corrected in SageMath 9.8:

sage: E.<e1,e2,e3> = ExteriorAlgebra(SR)
sage: e1.interior_product(e1)
1
sage: (e1.interior_product(e1)).constant_coefficient()
1

So the solution is to install SageMath 9.8. or to select a SageMath 9.8 kernel on CoCalc.