Steps to reproduce:
Find/Make a very flat area
Place one water source
Go to the corner and build like I did on the images below
Observed results:
Part of the water source you placed "uselessly" will somehow flow up on a weird way
Expected results:
The water physics should still make sense
How I discovered this:
I tried speedrunning the game, while for almost 6 years I didn't even kill the Ender Dragon. When making the portal without mining obsidian(a speedrun tactic), but next to naturally generated flowing water, I consider this really weird. Anyway I was playing on 1.17.1 except on 1.18 because the world is less deep to find lava.
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We're tracking this issue in MC-4533, so this ticket is being resolved and linked as a duplicate.
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