Sadly, I'm not always unoccupied enough to comment though.
A lot of it is time, I try to comment properly on my own post at least.
As to the error... that's likely something in the config but I haven't looked personally at how Beem works. If you toss me whatever libraries you're using I can probably dig through it and find out though!
A few months ago, there were no errors (same code). I know BEEM is deprecated but what else is going to replace it?
Yeah... until it really breaks, probably nobody's going to bother replacing it.
Looks like there's a function to call for nodelist, and an optional param to remove dev nodes. Might solve your problem if you toggle that bool. The .dev suffix could be a red herring though and not actually a dev node. Gods only know.
https://beem.readthedocs.io/en/latest/beem.nodelist.html
Thanks, I'll have a look at it, in the next few days.