As a first iteration of content negotiation, we want to do on-demand downgrading of Parsoid HTML before serving it to the clients. For VE this means that an edited downgraded HTML. will come back for transformation. So Parsoid html2wt endpoint should be able to correctly handle a. transform request with edited-html-v1, original-html-v2 and original-data-parsoid-v2.
The originals will be matching and the render will be correct, just the format version of the edited HTML will be different.