Issue 1:

/zone flag regen true -- doesn't enable regen
/zone flag regen enable -- doesn't enable regen
/zone flag regen 1 -- ENABLES REGEN!

Issue 2:

/zone child -- doesn't output anything (doesn't set a child)
/zone parent -- doesn't output anything
Example:

/zone create test -- creates test zone
/zone save
/zone create sub -- creates sub zone
/zone save
/zone edit test
/zone child sub -- does not set sub as child of test
/zone save
/zone edit sub
/zone parent test -- does not set test as parent of child

Issue 3:

/zone flag sanctuary true -- sets sanctuary to ON but still take damage inside of zone