Invalid Action - cannot resolve or edit page?

I have a page that was working, but there was an optimisation tip about repeated queries. I was able to web publish the app as it was a few hours ago.

however, now that page does not work, if you navigate to it it is blank, and in the project there is an error saying invalid action. The most recent action would have caused a crashing error so we have undone it for you.

There is a close button, but when I click it the error keeps coming back. I cannot see the list view or housecards on the page at all to edit. When I click them in the widgettree, the properties don't appear on the right hand side, it remains the main page properties so I cannot edit the backend queries.

I have a collection of items (dogs) that I want split into 2 different list views based on the data, eg one listview is in a tab for where the status = "Competing" and the other tab has a listview where the status != "Competing"

Can anyone advise what I do to try and fix this as I can't seem to even access any properties to change anything?

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