in my current save, if I open the production charts, I can make it so that it doesn’t display the bottom chart any more. This is 100% reproducible, at least in my save.
Open the production charts for the first time. The food charts is working (I can see the chart for all items)
Go to the manufacturing tab (2nd one), an move your mouse over the items. At one point, the chart will not be siplayed any more.
Going back to the first tab, and it also do not work any more…
Oh, I forgot to add that going back to the menu and loading up the save file, will make step 1 wotking again. But step 2 will still make the bug happen again.