I've found an error when displayig inserter throughput values when transferring items from belt to chest. Different behaviours apply, depending on the direction of the belt w.r.t. the inserter-chest pair. The official Factorio Wiki backs up the behaviours found while testing, see paragraphs Belt to chest (perpendicular) and Belt to chest (facing inserter) sections: https://wiki.factorio.com/Inserters#Belt_to_chest_(perpendicular).
Example: Stack inserter + perpendicular yellow belt
Displayed value: 6.79
Expected value: 7.50
In-game testing: https://imgur.com/a/1cvvltU
In all the examples displayed in the screenshot, inserters show a throughput of 6.79, which is correct for the 3 examples on the left with facing belts (overflow chests get some green circuits), while in the other 4 examples, the throughput of an inserter moving items from a perpendicular belt to a chest is actually 7.50 (no verflow items).
Same behavior applies when doubling inserters (even if it shows 6.79, 2x stack inserters will completely void a yellow belt and leave no overflow, thus having a throughput if 7.50 items/s as also shown in the wiki)
