Two separate issues here, from what I can tell.
The first is that you have four chem plants trying to fill four tank cars without a buffer - that's going to take a long time once the train shows up. It looks there isn't any lubricant in your pipes between the plants and pumps, it's getting pumped ...

Seems like it might be the same issue in the recent report here: 126669

Looks like Rseding is looking to confirm if there is a specific patch number where the behavior started and get a copy of a save file that it happens on.

Oh dear, smart belt got fixed! I am so happy rn :D


"Everyone who got all their bugs resolved in 2.0.34 step forward.
Not so fast, smart belt dragging"

https://forums.factorio.com/126613
https://forums.factorio.com/126645

(To be clear - nothing but respect for the devs. The reported bug was ...

Thanks Loewchen - I'm not seeing a difference in behavior. I'm on 2.0.34 now:

I had a belt that meandered between two lanes because of placement of regular splitters (on a spaceship originally, space constrained). I went to add a second belt in the lower row, using the smart belt drag, and while it successfully put an underground section to build the lower belt, it removed ...

Ah... I saw that post, but it looked to me like it was more about items that were tile-types as ingredients in recipes, and pipetting in remote view. I had not seen the part you highlighted from StrangePan, which is a real bummer. I came very close to placing a couple of hundred legendary refined ...

Follow-up: In that same test save, I confirmed that for stone brick, concrete, hazard concrete, refined concrete, refined hazard concrete, and landfill that using pipette tool on placed tile will result in the highest quality tier item currently in inventory, rather than the normal quality, always.

If I have legendary refined concrete in inventory and I use the pipette tool on a placed (normal quality) refined concrete tile, I end up holding a stack of legendary refined concrete (I would expect normal quality refined concrete). It doesn't make a difference if I have the normal RC or not. I've ...