`Field resolution` selecting only first member for nested union (bitfield)

[mishka-freddy]

Version and Platform (required):

• Binary Ninja Version: 5.1.7539-dev
• Edition: Commercial
• OS: Windows 10
• OS Version: 10.0.26100 Build 26100
• CPU Architecture: x64

Bug Description: For nested unions (or bitfield) field resolution sets always first element of bitfield (in my case AutoBoostActive). Even when I select next.

Steps To Reproduce: Please provide all steps required to reproduce the behavior:

1. Go to NtGetContextThread
2. Right click on AutoBoostActive
3. Click on Field Resolution
4. Select SystemThread
5. See that nothing changed

Expected Behavior: It should change to SystemThread, but it doesn't.

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