observed for several cycles, production bulding (in seen case metal refinery) loses its production focus after being disabled and re-enabled by automation grid, meaning one have to change the production orders to 0 and then again to any. when the automation disable/enable happens again, its needed to reset the fabrication orders again. as seen on screenshoti have all the materials and stuff to make prouction go on.
it presisted on loadgame, thus im not sure if its just my save.
attached save just incase.
build production with auttomation control, add fabrication order, wait.