It's just levitating striders. I don't know why, but they soar over lava in two blocks. You can push them, but they will slill levitate and just slide on air.
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Yes, my report duplicate that report. I created this world in 1.14.4. I was playing at snapshot 20w19a and then I update to 20w20a this happend
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In what version did you make your world? This may be a duplicate of MC-181495