[0.13.18] I can disappear items in a train car's by clicking

[Advacar]

Save was started somewhere around 0.13.12. No mods (working on lazy bastard). I'm setting up an oil train and I reserve slots in the car for a few stacks of full and empty drums. I made a new train with one car, got in the engine and auto-rode it to the oil drop off which started filling the car with empty drums. While they were loading I middle clicked the first two stacks to reserve them, then tried to move one of the stacks so I could reserve that space for full drums. (Which wouldn't have worked anyways because the car was still being filled and the new drums would've taken the spot. As soon as I left clicked on the stack, without releasing, it disappeared. I tried it on a few more and they disappeared as well. I don't see them in either my inventory or anywhere in the train. This behavior continued even after the train departed the station. Save file attached.

[Mooncat]

Because you have set "Empty barrel x0" in your auto trash slot, all empty barrels are automatically go into the logistic trash slot.
Remove the empty barrel in the auto trash slot and it should be fine.

[Advacar]

Yeah, that's it. Didn't think they'd instantly jump to it without actually putting it in my inventory. There was also no sound so I thought it was a bug.