Can't add a router (error adding it)

I am trying to add a router but it isn't letting me add it to a specific branch of my workflow.
It will let me add it to any other branch except this one.
The branch I am referring to is the one with the router but nothing after it.
I have tried leaving the workflow and going back in.
It seems to think there is already a workflow but there isn't one.

I have tried cloning and it doesn't working doing that either.

I have now created a workaround using a rework of my workflow and creating an extra filter.

Hi @dan90,

Could you please record a short screen recording showing exactly where you are encountering this issue so our technical team can look into it?