Known issueFixUpdated · 2 replies on Steam
Find the Needle: Converyer Belt Issue (Workarounds)
Short answer
Suggested fix (unconfirmed): Pick up the stuck ball of hay at the pinch point to jump-start the belt. Alternatively, destroy the blocked patch of belts to reset the flow.
The problem
sometimes on turns , and sometimes ahead of machines, the belts will stop for no reason at all, and they won't continue past their "kinked" position, until you interrupt the connection either by destroying the patch of belts, or by walking up and manually tossing a piece of hay ahead of the blockage. doing both of those actions seems to jump start the line to continue again. the same blockage…
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Source: original Steam Community discussion. Quotes are shortened; all credit goes to the posters.