BPMN11 — Multiple None Start Events inside of a sub-process

What would be the semantics of having multiple None Start Events inside of
a sub-process? Should this be allowed.

If the start events are on the sub-process border, then the semantics are
clear. A sequence flow would target the start event and thus determine
which start event would be triggered.
But what happens when the start event is inside the sub-process? Will
multiple instances of the sub-process be created? This doesn't work given
that the sub-process instance is created when a token arrives via a
sequence flow. If one instance is created then we have a conflict with
the current spec semantics, in which each start event results in a new
instance. And would tokens flow out of one start event or both?

see above