I've been strugling playing minecraft in an android because of these delays. It affects, as a pvper, my gameplay, and possibly others too. Heres a list of things that are affected with these delays

1. The button loading delays so much. What i mean to this is , example, pressing the play button. Normally it takes like a second or 2, but now it takes like 20 seconds. Not to mention, even opening inventory and chests are affected with this. 
2. Chunk renders too slow. I've been lowered my render distance and graphics of my game but blocks rendering too slow. But this arent affected by mobs, and, funny enough, chests. This was also give an exploit where slow block rendering can give time to players to xray through blocks and find tresure chests. 
3. Sound delay. This is somehow related into chunk render, because after thr chunks loaded, the sounds will just start instead from the real start. This affects the gameplay that relies to listening.

Thats all the bugs i've seen, and probably more that i havent seen yet. Anyways, heres some image of me playing in a server with these bugs.

If this could help you, then please check the new added ray tracing option, even mine is turned off, check it still, cause my suspicion is the cause of these bugs is the new features added, in this case, the ray tracing option.