\overrightarrow{AB} seems to work for me on the katex site.
I've tried it in tiddlywiki 5.1.1
5 (the latest release) and as you say it doesn't work.
I opened the latest version posted by Jeremy above and tried
$$\overrightarrow{AB}$$ in a new tiddler and it works so it seems to be
something added between the current and new versions.
If you drag the new katex plugin linked above into your tiddlywiki it should
work... Back up first :)
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