I first notice it here in my stream - https://www.twitch.tv/videos/399730938?t=00h24m46s
I show it again here - https://www.twitch.tv/videos/399730938?t=00h28m47s It's a minute or so before I open schedule
And later around 2:37 if you care to skip to there too.
A screenshot of the schedule

I later set up outposts, and regular cargo trains have no problems picking up shells and leaving to drop them off elsewhere. It's just the artillery wagon train that is affected.