While re-organising on my freighter and having removed some Medium Refiners, I found myself unable to place them again. A notification shows it needs a structure to attach to. Apparently they removed snapping points for both Large and Medium Refiners on Freighters. Large Refiner can be placed freely, Medium Refiner can no longer be placed.
Note: I can’t capture the notification as that layer is ignored with ‘print screen’ for some reason.