It appears that the official https://github.com/godotengine/FBX2glTF has received some fixes that haven't been pulled into https://github.com/barcoderdev/FBX2glTF yet
According to V-Sekai/unidot_importer#19 they have reviewed and are supportive of your modifications
Could you please submit your changes upstream as a PR or update barcoderdev/FBX2glTF from upstream?
It appears that the official https://github.com/godotengine/FBX2glTF has received some fixes that haven't been pulled into https://github.com/barcoderdev/FBX2glTF yet
According to V-Sekai/unidot_importer#19 they have reviewed and are supportive of your modifications
Could you please submit your changes upstream as a PR or update barcoderdev/FBX2glTF from upstream?