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I have some inserters grabbing rocket fuel of a line of rocket fuel and spoilage. The spoilage is led on to a burning setup, but the rocket fuel is transferred to chests.
The line got stuck after a while (somewhere between 5 minutes and 2 hours), with 1 rocket fuel in the splitter preventing the spoilage from moving on, see attached image. Inserters on either side of the splitter do not take the item out. I would expect at least one of the two inserters to be able to grab out the rocket fuel, restoring movement to the belt.

Some testing shows that this happens whenever there is spoilage laying in the two last item spots "beyond" the splitter on the bottom part of the belt. The items seem to be kept in limbo unable to be picked up to fix things.

(the manual fix is to remove the spoilage that creeps past before you set the filter, whenever you build an unfiltered splitter like this. This also doesn't work here since nutrients will replace them and then turn into spoilage later)

Thanks for the report however i am not considering this to be a bug.

Inserter takes from the splitter's output line. Top inserter does not take it because that output is only for spoilage, and the bottom inserter does not take it because there is a spoilage on the bottom output that is most likely caused by the nutrients going past the bottom output and then spoiling. Rocket fuel is unable to go past the bottom output because the line is full.