New OS X launcher (1.6.44 and above) won’t start after a 1.9 snapshot game is opened

The new OS X launcher (with bundled Java runtime) will not start when a 1.9 snapshot game is opened. Previous game versions (tested 1.8 and 1.7) don’t cause this issue.

Replacing the Minecraft.app bundle with a clean-slate version from .dmg, running it (allow it to download runtime, etc) will clear the problem and launcher will start properly.

This happens with 1.6.44 and 1.6.45-dev versions.

Anytime launcher gets stuck, the following can be found in Console.app:

16/09/15 14:17:10,000 kernel[0]: Sandbox: launcher(7340) System Policy: deny file-write-unlink /Users/riddle/Library/Saved Application State/YES.savedState/restorecount.plist

Also, trying to select `launcher` application in Minecraft.app bundle will crash the Finder, OS X’s default file manager. Just selecting it, not even trying to open.

There is no error in nativelog.txt. Contents attached.