Hi ShinoHarvest,
First of all, thank you for pointing out the other mod. The fact that it hadn't been updated was the reason why I programmed my mod. I used Shia's mod as inspiration.
Now to the problem you reported. I was able to reproduce the problem in my test environment with Bob's inserter. I have already found the cause. To detect whether an inserter is blocked, I check whether it is holding items and whether the drop_position is the same as the held_stack_position. When the drop position is changed by Bob's inserter, these positions are evaluated as unequal by Factorio, even though the values are identical when displayed. Unfortunately, Shia's mod does not help with the solution, as it uses the same method to determine a blockage.
However, I am working on the issue. I need to find a solution that does not cause desyncs in multiplayer, does not affect the function of the standard inserters, and does not compromise performance.