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I assume this is tightly related to [0.16.4] Sideloaded underground belt gets stuck (55055)

When spliter feeds underground belt, one line may stuck - there are stuff to insert into underground, but there is nothing coming.

I managed to reproduce this problem on sandbox map. Since items are 9 pixels long and belts are 32 pixels long, my test uses spliters and branches of different lengths. In my setup if this bug happens, it always is on third branch.

In attachment is my map where this bug happend. Map contains replay data (1 minute 58 seconds)

Second fail. This time i reduced build size so it fits 50x50 map.

In attachment: Map with this bug, again on third branch. Map contains replay data (1min 22s)

Another fail, same build that fits in 50x50 map. Replay data (48 seconds). Some belts were cut to speed up initial feeding. Again happend on third line.

It looks highly repetitive. it happend 4 times out of 6 tries. Blueprint can be extracted from my inventory after loading this save file.

Thanks for the save file with the replay. I was able to find what's broken by watching it several times in slow motion. It's now fixed for the next version of 0.16.