Experiencing the same issue. I have a refinery vessel connected to a station via a piston arm and I am unable to pull anything by using the commands. Manually it works fine.

I was going to try if it had something to do with there being 2 Piston blocks in the game one with the 1x1x2 and the other with the 1x1x3 dimensions. Currently I am using the latter. Will check tonight to see if the other piston actually wants to work properly.

Otherwise I might just scrap the piston from my current design until it gets fixed. I thought it used to work properly...

I can confirm that currently this mod does not seem to work through pistons. (for sure does not work as cargo -> connector -> connector -> piston -> cargo)

I havent tested it myself yet, just throwing this out there, did you set ownership of the piston and connector(s) to yourself? I only asked cause I was having issues at one point where half of my system worked the other half that I had just built wasn't, and it was all from my oversight of taking ownership. :)

Yep, everything is owned by me and faction shared - the rest of the system works 100%.

I just tested with pistons, items transferred fine. I tested how you had listed cargo -> connector -> connector -> piston -> cargo. Unless faction share has a flaw? I didnt try with share...is the only diff

Okay, I think I've figured out what's going on. I just removed my piston and built the two connectors right up against each other. It still didn't work, but when I just put regular pipe instead of the connectors it worked properly.

I think it has something to do with the fact that all of the containers are on the same grid, but we're trying to split the conveyor network with connectors.

I've never had any trouble feeding items through separate grids via connectors, so long as they are locked. My construction drone is configured to instantly restock with components and fuel when it docks with a workshop.

I also use connectors as toggling gates for separate conveyor networks on the same big ship: lock/unlock them with a button to let specific materials through. Handy for the life support mod, if you don't want it eating all your stone and water constantly.

That's exactly what I've done in my station. Instead of having the piston and connector, I just put two connectors together. However, when I locked them, none of the materials transferred through, though I could do it manually.

I seem to have the same problem (with pistons)
More than one ships are connected to a bigger ship via connectors (1 directly and one via a piston)
The 2 small ships are configured to pull computers (both with priority 2).
The bigger ship can provide some... but only provides to the shipt connected directly (connector to connector).
Everything is owned by me (single player world).
Do you have any other tricks I could use to make this work through pistons?
Edit: I can manually move those computers between the 3 ships)

I have problem with pistons here as well.. but it is strange... i have one large ship miner connecting to refinery base with shipcargo-piston-connector-connector-basecargo combo - this works like a charm, no problem detected, ores transfered to base cargo, miner ship reactor refuelled automatically.. but each other large ship I build with this setup simply doesn't work.. with exactly the same setup: cargo-piston-connector-connector-cargo.. strange if I can say.. the first ship (miner) I have built with this setup works, the rest have to be transferred manually.. still great mod imho, saves ton of work