I also noticed this was the case.
I noticed some differences in each of the most recent versions of ThingWorx.
- HTML column renderer works just fine
- They added "raw" or "with formatting" as format options for the html column render. I could find no discernible difference between the two options, as both simply displayed as straight text. eg. <a href="https://google.com"> TEST </a>
-This was submitted as a PTC support case for 6.0.2
- The "raw" format options shows the html as text, as in 6.0.2 and probably as intended, while the "with formatting" option shows the html formatted correctly, and the above example would just show TEST in that column
- However, TEST is just text, as the link does not format correctly. Its not a clickable link. It looks like the html renderer doesn't handle special characters very well
-This was submitted as a case for 6.5.0
So, in summary, you aren't alone, hopefully they fix it with the next release