Document Exists option doesn't appear

Hi there!

I'm trying to set up an action on page load, where a collection is queried on Firebase and then a page state variable is updated based on whether that document exists from the action output. I did that on a component, but for some reason, when I try to do the same on a page, the "Document Exists" option doesn't show up.

Here is a print screen showing that the option is appearing on the component initialization action chain:

And here is the print showing that the "Document Exists" option is unavailable on the page load action chain:

Any help is appreciated!

Thanks in advance!

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