[1.1.72] Transport belt does not read corectly

[Jviselesyeux]

Hi.

My problem is the following : I´ve tried to alternate 6 electronics circuits and 3 advanced circuits on one side of a transport belt using one "primary" transport belt of electronics circuits, one "secondary" transport belt of advanced circuits perpendicular to the "primary", and one decider combinator.
When the "primary" belt is full the setup works as intended, but if it is sparce, then the belt which is set to "Read belts contents/Pulse" does not read the very first item (advanced circuit in my exemple) which is laid on the primary belt.

I made 2 simple setups in a sandbox save to illustrate.

I'm looking forward to hearing from you.

Thank you for your time in advance.

[Loewchen]

It tells you this exactly this when you hover over the check mark.

[Jviselesyeux]

Thanks a lot for the quick answer and sorry for my mistake.