Hi,
The weather radar shows 'no data' in part of The Netherlands and adjacent part of the North See. When looking at other weather radar sites like the in The Netherlands also popular [Buienradar]. This is the case for some weeks now. Sometimes the 'No Data' area becomes normal (no text, no dots) or it gets smaller, but still has no data.(https://www.buienradar.nl/nederland/neerslag/buienradar/actueel) data is shown at those locations. Assuming you get your data from the same source the data should be available I guess. Both screen shots are taken on 8/24/2020 around 12:05 PM
Kind regards,
Bob Lindeman