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Moon Domain Power of "Moonbeam/30sec" consumes a prepared level 3 spell slot and does not work at all if you have no available spell slot.
There are many other comparable Cleric Domain Powers which do not consume spell slots. (Sun for example, allows you to cast Sunfire/1min NOT consuming a spell slot.) This leads me to believe it must be a bug of some kind.
Hoping this can be looked into and fixed!
Sincerely: Someone hoping to survive early levels </3
Can you give more details:
For you, the day Kenji overhauled your class was the most important day of your life.
But for me, it was Tuesday. 
To-do list
After further testing, this is likely constrained to Cloistered path clerics only, where all their domain powers are somehow treated as spontaneous casting instead of a free cast.
For you, the day Kenji overhauled your class was the most important day of your life.
But for me, it was Tuesday. To-do list
Saw the 2nd comment about what you discovered but here's some more information on how I am experiencing it, anyway, in case that is helpful.
Also just now tested and: Illusion Domain Power of Invisibility Sphere (the 2nd domain of the character experiencing this issue) does NOT consume a spell slot, interestingly enough. Did not use that one really until now, since I just recently hit the required level.
Thank you tons for looking into it! Let me know if there is any more information I can provide or testing I can help with.
After further testing, the Domain Power only treats itself as Spontaneous Casts when said spell is also listed as a Domain Spell.
On the dev side, this has more to do with how Spontaneous spells are set up for Cloistered Clerics. The way to fix this would be to avoid making Domain Powers having the same spells on the Domain Spell list.
We'll also need to take into account that one can choose up to two domains, and it's possible that one domain's power may be another domain's spell list, and the same problem will occur.
However, changing domain spells will affect other non-cloistered path clerics, somewhat, so it is also a balance change. The team will decide on what to do, standby.
For you, the day Kenji overhauled your class was the most important day of your life.
But for me, it was Tuesday. To-do list