meek-http-helper doesn't shutdown cleanly in 6.5a1

I've got this process hanging around after I close TB 6.5a2,

/Applications/TorBrowser.app/Contents/MacOS/firefox --invisible -no-remote -profile /Applications/TorBrowser-Data/Tor/PluggableTransports/profile.meek-http-helper

Seems reproducible enough on this day.

Using meek-amazon. meek-azure no longer seems reachable.