Precision Tree's Overheal and Maokai

So, I was experimenting with some runes and thought "hey, maokai has a heal, let's try overheal" The way Maokai's heal works is that you auto attack while your passive is up and heal **_only when you're missing enough HP_**. The problem with this means that Overheal won't activate all the time, but there are some cases where it _does_ overflow. This is pretty frustrating because I wanted to have a decent shield on Maokai basically all the time, but the interaction won't let me. Is this intended or nah?
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