Issue Summary

After the change in the field's context, the issue view screen shows the old value and the transition screen shows value as None.

Steps to Reproduce

1. Create a select list field TestField and add options Option1 & Option2 in the global context.
2. Add the field to the screens used by the TestIssueType issue type in the TestProject project.
3. Create a test screen > add TestField to it > add the screen as a transition screen to one on the transition for the TestIssueType in the TestProject.
4. Create an issue Issue1 with value Option1 for the TestField field.
5. Try performing the transition which you edited in step 3 above. The same value Option1 will be visible in the transition screen.
6. Now, add a new context in the TestField for the TestProject and add the option OptionA & OptionB
7. Go to Issue1.
8. Issue view screen shows the value Option1 and when you try changing the value, OptionA & OptionB are listed.
9. PROBLEM-> Try performing the transition to see the transition screen. The value of the field TestField is shown as None and when you try changing the value, OptionA & OptionB are listed.
   In short, 
   The issue view screen and the transition screen are showing different values after changes in context.

Desired result-

Both the issue view screen and the transition screen should show the same value for the field after change in context.