P: Auto-complete text in Keyword Tags field...

Updates to Camera Raw, Lightroom Classic, and the Lightroom Ecosystem were released yesterday evening and contain a fix for this issue.  Please install the appropriate update and see if it solves this problem. 

Thank you for your patience.

As a workaround while waiting for this to be fixed, try deleting the Helper.lrdata folder (Windows) / file (Mac).  See here for details: 
https://feedback.photoshop.com/photoshop_family/topics/deleting-a-keyword-from-the-keyword-list-does...

The unwanted auto-completes may start slowly coming back, and then you could delete Helper.lrdata again (ugh).

So... it's been nine months and multiple releases, but this PITA is still negatively impacting my sanity. My stock agency wants a zillion keywords per image, so having a majority of my entries auto completed WRONG burns up a lot of whatever lifetime I have left.

Hi Michael,

Thanks for reporting this. We have been able to reproduce this and have logged a bug for the same.

Thanks,
Smit Keniya
Lightroom Classic Team
Adobe