Well spotted! I also have the same issue with my CTF data.
This bug seems to date back to 2019 (see
(1) and (2)) and has not been fixed.
I’m not sure if this will cause problems later in your pipeline. In the past, problems with computing the adjacency matrix for cluster analysis have been reported.
You can manually change the channels from mag to grad. Here’s a helpful suggestion: wrong meg channel - #4 by mscheltienne
It might be worth filing an issue on GitHub, so this gets fixed. From a quick look, I did not find any issue filed regarding this topic.