nunit task broken after upgrading to 5.14+

Summary

After upgrading to 5.14.5 or 5.15, some users are finding that nunit tasks are broken.

Expected Results

Nunit tasks work

Actual Results

Nunit tasks break with identical symptoms to BAM-13803 - Renaming a capability breaks task configurations

Workaround

1. Try to re-save the NUnit task configuration with the correct executable selected, if this doesn't work then:
2. Delete and re-create the NUnit task configuration