Crash on startup due to Output port issue

[BeNJ]

Hi,
I'm a little at a loss so I figured maybe someone here would have an idea
of how to get out of this situation.
My NiFI is crashing on startup with the following:
--------------------------------------
2022-07-31 03:10:05,448 INFO [main] o.a.n.c.s.AffectedComponentSet Starting
the following components: AffectedComponentSet[inputPorts=[],
outputPorts=[], remoteInputPorts=[], remoteOutputPorts=[], processors=[],
controllerServices=[], reportingTasks=[]]
2022-07-31 03:10:05,452 WARN [main] org.eclipse.jetty.webapp.WebAppContext
Failed startup of context o.e.j.w.WebAppContext@3ed03652
{nifi-api,/nifi-api,file:///opt/nifi/nifi-current/work/jetty/nifi-web-api-1.16.0.war/webapp/,UNAVAILABLE}{./work/nar/extensions/nifi-server-nar-1.16.0.nar-unpacked/NAR-INF/bundled-dependencies/nifi-web-api-1.16.0.war}
org.apache.nifi.controller.serialization.FlowSynchronizationException:
java.lang.IllegalStateException: Cannot add Connection to Process Group
because source is an Output Port that does not belong to a child Process
Group
--------------------------------------
I only restarted because out of nowhere i started seeing the following
errors repeating:
Processors cannot write to Content Repo: Unable to write flowfile content
to content repository container default due to archive file size
constraints; waiting for archive cleanup

To resolve this issue, someone said online to set
nifi.content.repository.archive.enabled to false. I restarted and nifi
wouldn't come up again.

I've tried reverting the flow.xml.gz to the oldest one in the archive
folder (was from 7pm yesterday), no luck.
it's a large config (1000+ active processors).
I would try to disable / delete the offending output port, but I don't see
how to find it from the logs.

Any direction would be greatly appreciated.

Thanks,
Benji