It appears that between version 82 and 94 the MarkDown Card no longer renders markdown tables. Here is a post that shows the table details.
1)Can someone help me to get this functionality back please, or update it to another working version (ex: change it to html, but that doesn’t appear to work either)
2)Help me to understand why the functionality went away.
I played with Tables on the Markdown Card some and had no luck, same as you.
However I tried it on a new mark-down plug-in and it seems to work.
Maybe give it a try: