When I posted above, I had 2016 and 2018 open with two separate projects with links from different consultants, both had the same results… 
@MJB-online I just had a look at that posts’ solution; the Python script requires the tag elements as inputs, and it seems neither @jacob.small and I are able to select or collect tags associated with linked elements. But given that that workflow was a solution, selecting/collecting tags associated with linked elements shouldn’t be a problem or at least wasn’t in the past…
I can’t remember if this has ever been an issue on my computer before, nor when I last tried, so can’t think of any new packages or updates that might be causing this. Maybe others will chime in and test out if they are experiencing the same issue.