If I place a path block one block up from where I'm currently standing, then try to jump up on that path block I run into an invisible "wall" of sorts, akin to when you get a ghost block.
You can walk around the wall and you can jump up onto it again which remedies the problem.
Thank you for your report!
We're tracking this issue in MC-188987, so this ticket is being resolved and linked as a duplicate.
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