For the titles like that which don't show up in the My Updates report, the best way to find them is to navigate to the My Movies page and apply the following filters:Ahhh.....I didn't know this. I thought that it was the same as a Dolby Atmos track being added. This is good to know.
- Not downloaded to...
- Video Quality (e.g. "Dolby Vision" and/or "HDR10").
In fact, while I was confirming the filter settings I recommended above, I found 5 movies in my own collection for which HDR10 or Dolby Vision versions had been added.
And since you wouldn't be downloading these as an update, if you want the SDR version to go away, you'll need to manually delete that version using the local browser interface, the mobile app, or the store's "Delete" option.

