Isolines disappear in long-term forecasts (ecmwf model)

Good evening and happy new year.
The 500 hPa isolines disappear with the ECMWF model in forecasts for 8 or more days. Is there a solution?

User 894530991
We currently do not offer these layers from this model. Use ICON or GFS model.

Ok. I believe the ECMWF model is one of the most reliable. I hope you can also use it for the 500 hPa isobars.

User 894530991
ICON is great as well. You can try it.