We've created a flow that will automatically create an incident in servicenow when an email is received to a shared mailbox. Using the flow "When a new email arrives in a shared mailbox" we ran into an issue that the "Has Attachment" configuration is either set at "yes" or "no" (this really should have an "any" option as well) that we set to "yes", and any emails without an attachment would not trigger the flow. So our solution to this was to build a parallel flow that has the "Has Attachment" configuration set to "no" and that does pick up the emails without an attachment.... but it also is picking up the emails with an attachment, creating duplicate incidents.
And as I typed this, I realized I probably could just turn off the one built specifically for attachments, and let the one that is set to "no" pick up both emails with and without attachments, but this seems like a weird bug/quirk to not just let it pick up all emails, regardless of attachments?