[Bug] xrefs not updating when setting data vars in python

Version and Platform (required):

• Binary Ninja Version 5.0.7486
• Edition: Non-Commercial
• OS: Windows 11
• OS Version: 24H2 26100.4349
• CPU Architecture: x86_64

Bug Description:
When setting a type for a datavar in python, the Data References don't get updated in the UI.

Weirdly however, if you set the type to a string containing the name of the type, it does update the UI, however it takes significantly longer to process, which is no good for scripts that are running this hundreds of times.

Even if you force a re-analysis, it doesn't detect the xrefs.

Steps To Reproduce:

1. Open a project and pick an offset with undefined bytes to test with.
2. Copy the address, and open the python console and paste it in the python below, replacing offset with your own offset`

# set this to whatever address you want to test this in. I did it in a section of undefined bytes.
offset = 0xDEADBEEF

# create a dummy struct
ty = types.StructureBuilder.create(packed=True)
ty.append(Type.int(width=1), "testing")
ty = Type.structure_type(ty)

# define the type as "MyCustomType"
bv.define_user_type("MyCustomType", ty)

# get the type from bv, so that it shows the type name in the UI, instead of the struct layout.
ty = bv.get_type_by_name("MyCustomType")

# set the offset to the type
bv.define_user_data_var(offset, ty)

After running this, the linear view updates to show the new type, e.g. data_100323ea3: MyCustomType

However, if you click on the MyCustomType on that same line, you'll notice the cross references are empty.

If you now run this in the python console:

bv.define_user_data_var(offset, "struct MyCustomType")

and check the cross references again, you'll see that it now appears correctly. The same effect can be done by right clicking the datavar, clicking "change type", don't change anything, and simply press apply

Expected Behavior:
When setting the datavar to a type (the first codeblock), the references should be updated, just like they do when you set the datavar to a string containing the type (the second codeblock)

Screenshots/Video Recording:

https://github.com/user-attachments/assets/0b94b32c-40e7-4260-a274-8bdfa095df00

Binary:
General issue, not binary-specific

Start at the Python API entry point bv.define_user_data_var and reproduce the difference between passing a Type object and a string type name using the supplied script. Trace how each form updates the data variable and references, then verify that the Type-object path produces the same cross references without requiring a second update.