Contents of Description/Environment field get lost if saved in preview mode

Steps to Reproduce:
1. Launch JIRA.
2. Create/update an issue and enter data in "Environment" and description field.
3. Click the "Preview" icon to see the value in preview mode.
4. Click "Create"/"Update".

Result:
1. The issue just get created with summary and data in description and Environment field is lost.
2. This is a critical issue as user is here loosing data if saved in preview mode.
3. User like Nanako , first view data in preview and then save as data is complex.

Expected:
1. No loss of data

Additional Info:
Working fine on JAC