I can no longer select a WorldEdit region by punching nodes in the latest git version of Minetest.
Tested MT versions:
65d1cb8 (March 26): fails
5bd9c23 (March 23): fails
db98ef6 (March 6): works
My WorldEdit mod is up to date, so I think this problem must be due to a bug or changed behavior in MT.
Edit: This only affects the WorldEdit GUI; chat commands work fine with the latest MT git version.