References via relative pointer types are not shown in cross references

[bdash]

Version and Platform (required):

• Binary Ninja Version: 5.0.7284-dev (e7d42d95)
• OS: macOS 15.4.1
• CPU Architecture: arm64

Bug Description:
The cross references pane does not show references to a function or data variable from structure members that have a relative pointer type (void* __ptr32 __base(var)).

Steps To Reproduce:

1. Build the shared cache plug-in with [ObjC] Use relative pointer types for members of objc_method_entry_t #6700 in place.
2. Open a macOS shared cache, load MediaLibrary.framework, and wait for the analysis to complete.
3. Navigate to method_list_MLMediaObjectImpl.
4. Pick one of the objc_method_entry_t objects immediately after it, and double click on its imp field to navigate to the method implementation.
5. Look at the cross references pane.

Expected Behavior:
There should be a cross reference visible for the imp field that points to the function.

Additional information:
This also happens with the other fields of objc_method_entry_t.