Revision history [back]

This looks similar to what was fixed in SageMath trac ticket 19374, which was merged in SageMath 6.9 (but not in any previous beta release, including SageMath 6.9.rc3).

Related issues were solved more recently at SageMath trac ticket 19373 and SageMath trac ticket 19371 and will likely be in the next beta release.

To follow beta releases, read the sage-release mailing list.

Issues are also discussed on sage-support and sage-devel, see for instance this thread on sage-support.