teleporting long distances on a server cause you to fall before the chunks are loaded, and when the chunks load your position doesn't get corrected. this can cause you to get stuck in the ground and sometimes get buried dozens of blocks below the surface
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Nibby49
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Might I say I have been able to consistently replicate this issue on 1.14.1 mutliplayer in both creative and survival. Might I also add that this issue is amplified when teleporting inside a block (you tend to go straight through the world into the void). I hope this helps find and squash the bug(s)!
Technical Babble:
Computer:
OS: Windows 10
MC Version: Java, Vanilla 1.14.2
Server:
Version: Java, Vanilla 1.14.2
OS: Ubuntu
RAM: 2GB