For the 0z and 12z, they should not indicate after 4 days, « previous updates », because those run can display data up to 10 days so it should only be visible when you are in the 6z or 18z run

Something like this screenshot below would be helpful.

I'd love to be a part of the testers. Windy is my life :)

You can always follow the details of the updates and the run by checking the info button related to the model, so here ECMWF. Then you can see the details, when the last update happened and when the next one will be

Looking at my attach image, it seems that the "less accurate 6z-18z" times will always be forecasting the 4 days ahead and the "accurate 00z-12z" will be forecasting behind them?

Maybe the Windy team will have button to "compare" the different run times?

One remark : bear in mind that the 2 new run Windy will add for the Premium users only, so 6z and 18z, are less accurate than the 2 others, 00z and 12z. Indeed, 6z and 18z can only cover a bit less than 4 days when 00z and 12z can cover 10 days. This is why you saw this new function « previous updates » telling you that you are on a run using 4 days forecast so the data starting from the fifth day can only come from a previous run, either 0z or 12z