I found the same issue reported but for luminar 2018. I tried using 2 ways:
Method 1: From lightroom Classic CC > File > plugin extras > Transfer to luminar 3
Method 2: From lightroom Classic CC > Photo > Edit in > luminar 3
I edit the photo and click on Apply. It shows the bar indicating it is working and then Luminar closes but lightroom does not see the changes.
When editing in lightroom the main file is a raw file so when I choose "edit in " it allows only for "Edit a copy with lightroom adjustments" and it creates a version in format tiff and this is the verison that is transferred to luminar. This is the exact same flow as Nick collection but in that case it works well.
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