Api.turris.cz SSL certificate invalid (emergency Turris CA)

Hello,
I discovered weird line in my Turris system logs, which says there’s a problem downloading some file from Turris API. So I checked that URL and it uses some weird emergency SSL CA. It’s this URL. Is it some kind of bug?
Thanks for response,
David

Just for the record: this is duplicate and invalid.

See e.g. Api.turris.cz is missing certificate chain or Api.turris.cz SSL certificate is invalid