Factorio Forums

The fast inserters (with stack size 2) on my right in the image, are stuck trying to fit an extra locomotive and fluid wagon because the filtered cargo wagon doesn't want the extra item. This causes the inserters to no longer do work, when I believe they should be inserting the other items.

Not a bug per se. Either use more containers and inserters with only one item type each, or don't use a stack size greater than 1.

Above is right, not a bug.

Here's a NaB thread with posts from kovarex: viewtopic.php?f=23&t=7567, there are other in there and probably some more in Duplicates if you search for them.

If you do a general search across the whole forum you'll find others whom have run into the same issue and the various ways they've dealt with it: search.php?keywords=inserter+wagon+stuc ... mit=Search
Hope that helps you find a solution.

Alright, I've put the inserters to only transfer 1 at a time. It can be pretty difficult to know what is considered a game mechanic for players to overcome, to what is considered a bug.