Adding a ToggleGroupAttribute in my script instantly deactivates enums dropdowns in the Inspector

The same issue as reported in the #944, currently marked as resolved.

Note: It worked properly in 3.1.10.

Steps:
1. Define a simple enum
2. Use it for a field (either serialized or public) → It will work properly showing in the Inspector as a dropdown
3. Add a ToggleGroup attribute to another bool field (either serialized or public) → The dropdown stops working

Note: If you define the ToggleGroup field before the Dropdown, it works properly.

OS: Windows 11 Pro
Unity: 2021.3.16 f1

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