Its a UHS-3. the confusing part about these is that they are also called UHS-I . which makes it very confusing.
I currently use this same card on my Lumix G85 which shoots 4k video. Absolutely no issues. I also have the 64gb version that works the same.
UHS-I U3 (30MB/s Write), Class 10 (10MB/s Write) - see how confusing that is? lol the U3 stands for UHS-3