I’m using this too, but instead of adding and deleting notifications directly in the flows, I send the message in a text variable PushMessage to a debug notification flow.
The debug notification flow will send out the message if the z-Debug flag is active. See attachments.
After the flows work well, I just de-activate the debug flag.
Hope this helps.
PS in fact, in the example you can see I’m using a second variable OutMessage. This is useful as there is some delay when sending out notifications and other flows might fill PushMessage too before sending a notification.

