The pumpkin-scuba isn't working, you still get hurt when you are out of breath underwater.

Server Information:

WorldGuard Configuration Report
Generated 2011-08-05 12:42 -0700

Version: 5.2.2

Server Information

Java : Sun Microsystems Inc. 1.6.0_24 (http://java.sun.com/)
Operating system : Linux 2.6.18-028stab070.14 (i386)
Available processors: 8
Free memory : 445 MB
Max memory : 2499 MB
Total memory : 816 MB
Server ID : unnamed
Server name : Unknown Server
Implementation : git-Bukkit-0.0.0-958-g65a55ba-b1038jnks (MC: 1.7.3)
Player count : 10/40

Plugins

CommandBook : 1.5.2-customized
MagicCarpet : 1.5.6
BananaChunk : 4.6
HeroicDeath : 1.8.2.157
MyWarp : 2.0
WorldGuard : 5.2.2
FoundDiamonds : 1.666
Tips : 1.0.1
WorldEdit : 4.6
MyHome : 2.0
bShot : 2.4
VanishNoPickup: 1.9.12
NSCommand : 0.2
Permissions : 3.1.6
SpamHammer : 1.7a
OpenInv : 1.3.3
iChat : 2.3.3-p3
NoCheat : 1.11b

Unable to reproduce. Can anyone else test this? Also mind pasting the full config...? The top part alone is somewhat useless.

Lack of followup and inability to reproduce. Closing.
I suggest using dev builds of WG if you're going to use dev builds of CB too.