Posting new assignment scores results in code "failure" with no explanation for some assignments

@Todd DeSchuiteneer We're having an issue with posting scores for certain assignments. These scores can be edited by hand in the gradebook in MySchoolApp. Most are blank in the gradebook. One was previously set by OneRoster, not the teacher, so OneRoster should still be able to write to it if I'm understanding correctly. However, OneRoster returns code "failure" for all of them.

Steps to reproduce:

Post JSON like the attached to the /results endpoint for an affected assignment. The due date of the assignment in question is one day after the values of the score date and date last modified properties in the sample JSON.

Expected result:

The score is created.

Actual result:

{ "statusInfoSet": [ { "imsx_codeMajor": "failure", "imsx_severity": "error" } ] }