This strange thing generated in my world, i think it might be caused by the deep ocean and roofed forest biome have a way to high difference in height. See the pictures, it is a huge cliff(not intended i am quite sure of that). as you can see i put some glowstone on it to make it visible a little better.
[seccond bug]also:
i paused the game at this spot, went away for about 20 min, when i came back, minecraft suddenly sped up and it became night and day within a matter of secconds. (like the pause did pause my world, but not the time within the world)[seccond bug]
greetings,
Quimoth
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This seccond bug i did NOT search for. but i doubt if you have read my entire post.
so please read it over AGAIN.
the first part i am talking about a cliff, which is visible on the screenshots.
it has nothing to do with the day/night bug. it is a world generating error/bug.

Seed ?
sorry i forgot to post the seed.
for copy-paste lazyness: -5954229936912293072
i also added a screenshot with the seed

Cannot confirm.
Probably caused by MC-315
Recreate the world with a different name.
Simplifying this ticket to the most prominent of the multiple bugs posted here. It is much easier for us to deal with bug reports when they contain only one bug. Feel free to create new ticket(s) with additional bugs.
Duplicate of MC-34641 - If you have not, please use the search function in the future, to see if your bug has already been submitted. If you could not find the original report, please comment with the keywords you searched for.