Does your trait's definition at \\common\traits\ do anything with the trait's 'name = {}' block like the vanilla trait 'crusader_king' at line 8588 does ?
Is your localization file's encoding UTF-8-BOM ?
Is there anything related to the trait at \\Documents\Paradox Interactive\Crusader Kings III\logs\error.log ?
Does its index number overlap with any other trait?