Bullshit.... I thought that I should wait till I'll know how the old II474 segment will be dedicated. However, the routing of II474 is already clear. No need to wait. If the old segment will get any II numbering, I can add the route. And yes, Czechia is mounting signs with new numberings which are only officially confirmed months or even years later. If we always wait, we could wait for ages with every change...
II474's rerouting will come with the next site update:
https://github.com/TravelMapping/HighwayData/pull/6906