Busted.
The "x" versions are pre-release stuff. It can, and does, change rapidly. Sometimes it contains nasty bugs. The "x" releases are deliberately not made visible on the download dropdown - you have to know to fetch it with curl or pt3upd.sh and hope that I didn't just build something with a bug in it.
I make no attempt to version the "x" stuff -- there have been hundreds of pt3.3sx builds -- if you have one it is probably not the same as anyone else's 😉
Certain people have been urging me to get better about the versioning process.
On the bright side there are release notes 🙂