Under “Other apps” I have all my apk’s installed on my phone.. Weird. When I come back home, I can install CMF watch app on my Nothing Phone (1) and check it there.
EDIT: so, I spent some time with unpairing Watch Pro (2) from my Z Fold and pairing it with Nothing Phone (1) and yes, there is no calendar available! I went through all my settings (app, system, G calendar, …) and didn’t find anything out of ordinary compared to my main device. I just noticed, that when I open Notification tab on my Z Fold, it take several seconds to open, and as I mentioned before, I see there lots and lots of apk’s, while on Nothing Phone (1) it opens menu in no time, but I do not see there all apps installed on that device. So, sorry folks, I am not able to help you.. 😟😢