when I try to build a splitter with a filter if the belt input it full sometimes a unwanted item goes where it shouldn't go.

for example if I have a splitter with a filter for wood (or any other item) on the left exit, if the input belt is at full capacity and there is a fast change like full wood to full steel (or any other item) sometimes a item goes on the left exit (where should go only the wood).

this is a base game issue, not specific to my mods.

and as far as I know, it's not a bug, just a quirk of the intended functionality.

if you set a filter of wood on the left exit... then if there's wood, it will put it on the left exit, and anything else on the right exit... unless the left exit is blocked, then everything goes on the right exit.