Huawei and Honor: Ads appear on lock screens

Once again there is negative Huawei and Honor news. For two days now, advertising has been appearing on the lock screens of several of the manufacturer's smartphones. What's going on there?
Some Huawei and Honor shoppers in the United States, the Netherlands, Germany, and a few more regions report seeing ads on their lock screen. More precisely, this is an advertisement from the Hotel Booking website. Some of them on Twitter show exactly what this looks like. Our editor-in-chief David Wurm is also affected by the ads, as he was about the TechnikNews-Account on Twitter writes.
Lately I've been here on the #HuaweiP30Pro Advertising by @Booking displayed on the lock screen - who of you has that too? ^ dw @HuaweiMobileDe
TechnikNews (@TechnikNewsnet) June 14, 2019
#Huawei has turned the screen on the screen. Wtf fuck this pic.twitter.com/6dAUeu17Jf
- Alex (@ValexWhoa) June 13, 2019
Wtf https://t.co/Fv4RzUmM1D ads on my lock screen. Anyone else with a Huawei getting this? pic.twitter.com/ILI6vs6wVD
- Ed Spencer (@efjspencer) June 13, 2019
This seems to be particularly common among owners of a P30 Pro, P20, P20 Lite, P20 Pro and Honor 10. No other cases are currently known. In addition, the advertising only appears when you use the slideshow pre-made by Huawei on the lock screen. This can be easily deactivated in the smartphone's settings. Do you also see advertising on your lock screen? Tell us about it in the comments!
Street: Android Police