New Email Editor - Published Assets Not Recognized Across Marketo

We've started adopting the new email editor for select email sends, but I am finding that the emails I create are not recognized elsewhere in Marketo after being published. For example, we sent an email last week to a pretty large audience, but when I go to create an email performance report, the email is not listed in its program and thus, cannot be selected.

Yesterday, when I was trying to schedule one of these emails to send as part of a flow, the email did not pull up in the "Send Email" dropdown at all. I tried removing and re-adding the flow step, even creating a new smart campaign, but could not get the email to show up. Another user in my instance was able to add the flow step for me, but I still can't get it to show up.

Any ideas on what might be causing this?