The "?version=2" parameter allows to try CX2 in production. Currently, when the parameter is used to access the version 2 of the dashboard it does not persist once a translation is started. That is, you start in CX2 dashboard and you end up in CX1 editor when starting a translation. Reaching the version 2 of the editor would be the expected behaviour instead.
If we want to ask editors to try the new version as part of future user research we want this transition to show tools of the same version. That is, the version parameter not to get lost.
We also need to consider how this may intersect with T187985: CX2: Open in-progress translations with the same editor version they were created