In is written:

A few things which are work in progress: RaspberryPi images are using 4.19 kernels. We would like to move to 5.4 however,
isn?t working properly with it (as the new kernel requires firmware version => 7.45.202) for which no nexmon patch exists yet

However when following the referenced link then it would seem the relevant issue was closed in August 2020, so I?m a bit surprised the latest ARM/RasPi kernel is still 4.x

Are there other issues than the one listed in the blog entry, or did the closing of the issue go by unnoticed?