No idea what Posila workload is like. Officially loaders are not in the vanilla game, so fixing them may not be Wube's highest priority.
If you need to use deadlock loaders you could use the ZIP file in the post above, but you would need to visit all your loaders and check that they were working correctly.
From a personal point of view I would like to know why they even created a new entity type of loader (loader-1x1). Maybe with all the changes Rseding has done to get most entities to sleep (inserters / trains / miners) when not doing anything, there is a chance they could be planning on putting loaders back into the vanilla game.