BSbound wont export

[Hofgur]

@niftools/blender-niftools-addon-reviewer -

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Fill out the template below to the best of your ability, including .blend files, nifs, logs; help us to help you.

Issue Overview

[Provide a general introduction to the issue and why it is relevant to this repository]
working on a custom head and ive noticed BSbound wont export and the custom head is invisble in game. for fallout 3 and NV

Version Information

Blender Niftools Addon Version Info

[Provide version information for the Blender Niftools Addon the issue occurs with, available in Blender in the Add-On section]
latest

Blender Version Info

blender 3.5

Platform information

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Context

[Provide more detailed information to the issue itself and why it is relevant]

Steps to Reproduce

[Ordered list of the steps required for recreating the issue, including settings]
#.

Expected Result

[Describe what you expected to have resulted from this process]

Actual Result

[Describe what you currently experience from this process, and thereby explain the bug]

Possible Fix

[Optional, suggest fixes, improvement or reasons for the bug might have occurred]

Screenshot

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Logs and Files

[Provide logs file generated during the error as well as the blend and nif files are related to the issue]

Info Bar Output

[Output from the Info View, available at top of Blender viewport, drag to expand]

Console Output

[Set the logging level to 'Debug' and attach the output of the console. Enable via Window -> Toggle Console]

Blend File

[Attach the blend file if the issue is reproducible]
https://drive.google.com/file/d/1aj-Mq45Pe6qW13vNsLeNDeHSawbIyU_G/view?usp=drive_link

Nif File

https://drive.google.com/file/d/1Qommnwr8tiszc9jKuwn82s3UKlWOpq5p/view?usp=drive_link

Similar Known Issues

[Reference any known issues - https://github.com/niftools/blender_niftools_addon/issues]

Additional Information

[Anything else you feel is relevant]

[Candoran2]

Could you attach a nif file that has such a block, as well as your blend file, like the template asks for?

[Hofgur]

Could you attach a nif file that has such a block, as well as your blend file, like the template asks for?

done. it seems to work perfectly fine on the previous version of nif tools

[Candoran2]

done. it seems to work perfectly fine on the previous version of nif tools

Could you post them in a way that doesn't require requesting access? For example, in a zip file dropped directly into the issue.