If you stand on the edge of a block and throw something along the edge, whatever is thrown will slide along it until the item either falls off, or slides far enough to get stuck on top of the block.
Is the bug reproducible? How can you reproduce the bug?
See here: https://www.youtube.com/watch?v=YUfSUpvTveE
What is your operating system?
Win 10
What is your version of Minetest?
0.4.14
What game do you use? (e.g. minetest_game, MiniTest, dwarves)
minetest_game, no mods
No debugging log to work with.