Not sure if this is PF2E specific or not.
If you click the on HALF button, then run the /dmg slash command, the damage isn't halved.
In this screenshot, I ran /dmg 06 twice - once with CRIT to show it works with CRIT, and once with HALF to show it's not working with HALF.
Attachment 64405
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A second bug, /dmg calls with 1 digit don't do anything. You have to use 2 or more digits, so if you want to run a damage of 4, you have to type /dmg 04

