Looks like the last version was built with mio 0.6.5 which now has known bugs against it. This build includes mio 0.6.6
I've built a local copy with mozilla/sccache#79 and mozilla/sccache#78. Let's see if that helps #40240!
PRs can't land againt beta right now because the android bot is filling up on disk space. I don't really know what's going on but the android bot is the longest one to run anyway so it'll benefit from being split up regardless.
