I am upgrading a villager village, adding ladders to the higher levels. That's how I came across this issue. Minor bug fix, but annoying because the slight inconvenience. If you try to walk onto a ladder from a path block, due to it being slightly lower, the ladder will not let you get on. I expect it is the same for soul sand and almost fully stacked snow.
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However, this issue is a Duplicate of MC-3707.
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path blocks are not full blocks, they are more like a slab, so you need to jump to get over that difference