There are block glitches about netherracks when being mined by a Efficiency 5 diamond pickaxe

I made a pillar of netherracks to reach a pile of glowstones on the celling of the nether. I wanted to go down later so I can reach the ground level, so I used a efficiency 5 pickaxe to mine down.

Idk if it the pickaxe is too efficient, but when i mined to the ground level, my body hovers above a block. I turned my head to another direction,but was forced to facing downwards. I later put a block next to me and mined it and I could finally reach the ground.

1. Reaching a high place with netherracks
2. mine fown with a efficiency 5, unbreaking 3, silk touch diamond pickaxe

P.S. sorry I don't have attachments