UiPath Selector type 'document' randomly trun to type 'pane'

I experience that a selector of mine changes its type randomly.
It started being the type = ‘document’, which is great, as UiPath can Get Data quite easily from that, but then randomly, the type of the selector changed to type = ‘Pane’.

This obviously breaks my selectors. Is there a way to ensure the Chrome extension is consistent in its type generation? If not, is there any way to tweak the extension other than the standard interface of the UiPath Chrome application?

Alternatively is there other UiPath Chrome Application Extensions, and where can these be downloaded?

The selector is a PDF, that opens through the browser (Google Chrome)