Description template in next-gen project prevents saving changes in "Incident" issue type

Issue Summary

Saving issue type changes for "Incident" in a next-gen project that was a JiraOps project formerly, causes following error to appear:

Notes

Jira Ops projects have been converted to Next-gen projects, for more information please see: Concluding the Jira Ops early access program

This has also brought following template into Description field in "Incident" issue type:

Steps to Reproduce

• To replicate this issue you should have a next-gen project that was a JiraOps project formerly and auto-converted to a next-gen project

1. Go to the next-gen project > Project settings > Issue types > Incident
2. Make a change, e.g add a field
3. Click on Save changes

Expected Results

Changes are saved and following message appears:

Actual Results

Changes are not saved and following error appears:

A 400 error appears in browser DevTools:

{"errorMessages":["Failed to update issue type: defaultValue should be Map"],"errors":{}}

Workaround

If you want to keep the template in Description field, copy the template and save the changes, then re-add the template and save the changes again. Or remove the template if you don't wish to keep the template in Description field.