Why does the title "fig:" get inserted into this image link and, more 
importantly, how can I prevent that?

$ echo '![](foo.png)' | pandoc -f markdown -t commonmark
![](foo.png "fig:")

It appears to be fairly specific to CommonMark, i.e. it's not there for 
other flavours of markdown.

$ echo '![](foo.png)' | pandoc -f markdown -t markdown_github
![](foo.png)

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