When adding single keyword in Lightroom Classic CC it later adds “parent” keywords from legacy version of Bridge

I have had this problem with previous version of Lightroom (and Lightroom 6, 4, 3, Bridge CS6, CS5, CS4, CS3, etc.) for over 5 years, but cannot get a simple answer how to prevent it.

Over 5 years ago, before I was using Lightroom for keywording, I used to add keywords in Bridge. I had set up keywords under my own groupings for reference, with general descriptive (parent) categories, and more specific (child) ones under them. I did not want to add the parent keyword, nor did I want it to display, just the “child.” However, when I later opened images in Photoshop, looked in Get info, I saw the keyword, as well as the “parent” that I did not want to see.

So if I had typed a keyword such as Bushwick, I then got “Bushwick < Place- NYC neighborhoods/Landmarks”. I tried unchecking Automatically adding parent keyword, and some other troubleshooting steps as outlined here, but was never able to solve the issue.

I eventually stopped using Bridge, instead using Lightroom to do keywording, but the issue persisted, with the older system still being implemented. If I created new keywords in Lightroom, and added them to images, they were fine. But if I used a single keyword that had been used prior to 2013, and added it to new files created in 2017- never keyworded in Bridge, but instead being keyworded in Lightroom- they still get the parent folder description (keywords) added to the files. I really want to clean all this up, to be able to fully & succinctly keyword images without extra legacy garbage being pushed into files.

This happens on all raw files- NEF, DNG, etc, with the metadata being changed somewhere, and being visible in Lightroom and embedded in a file when opened and outputted. Although this stared when I was using Bridge for keywording, even though am only using Bridge to make camera raw adjustments, it is still affecting files in Lightroom while in Lightroom, so there is something happening behind the scenes with Lightroom, Bridge and/or Photoshop.

Thanks.