Investigate how fields cache options

[alschmiedt]

Describe the bug
When a dropdown field list refreshes the selected item does not match the real selection.
This occurs when an item in the list is renamed and causes a resort of the options list.
Bug was introduced in #3036.

To Reproduce

1. Navigate to test blocks
2. Choose Dynamic dropdown
3. Add 'aa', 'bb', 'cc' as options
4. Choose 'cc'
5. In the console rename 'cc' to be 'ab'
6. Observe

Expected behavior

Screenshots

Desktop (please complete the following information):

• OS: [e.g. iOS]
• Browser [e.g. chrome, safari]
• Version [e.g. 22]

Smartphone (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 22]

Stack Traces

Replace with error stack trace.

Additional context
The forum post found here describes the issue further.

[samelhusseini]

Fixed.