Heya! After 27th Februady changes in SoD, moonkins can now cast non-healing resto spells in Moonkin form.

https://us.forums.blizzard.com/en/wow/t/season-of-discovery-class-tuning-incoming-february-27/1794527

So no need for /cancelform in Moonkin form while casting buffs.
I fixed this for my self by changing ActionCast.lia row 135 to be as follows.

table.insert(m.lines, "/cancelform [nocombat, noform:5]")

Adding noform:5 to the dynamic macro generating solved unnecessary cancelform for me.

-Hessutar