Mlog to bind a @flare that is not already bound by another processor?

According to https://yrueii.github.io/MlogDocs/#unit-bind, binding to a unit is based on the age of the unit.

If I have one processor that is bound to a flare, and I copy that processor, I find that the bind on processor 1 is broken and the same flare is now bound by processor 2, even though I have other flares available.

So ... how do you make sure that you can bind to an unused flare when you create a new processor that tries to unit bind?