Is there an existing issue for this?

• I have searched the existing issues for a bug report that matches the one I want to file, without success.

Did you read the documentation and troubleshoot guide?

• I have read the documentation and troubleshoot guide

Environment

- **OS**: Ubuntu 20.04
- **Sage Version**: 10.0

Steps To Reproduce

K.<a> = NumberField(3*x^2 + 1)
P.<z,w> = ProjectiveSpace(K, 1)
phi = DynamicalSystem_projective([a*(z^2 + w^2),z*w])
phi.normalize_coordinates()

Expected Behavior

Should return a version of the point with normalized coordinates

Actual Behavior

the gcd step fails since it assumes clearing denominators gives back points in the ring of integers.

Additional Information

No response