had this same issue on the 20w51a snapshot and i was able to recreate it.
the player can end up at the overworld coordinates of the end portal instead of the obsidian platform if they are pushed into the side of an end portal block by a slime block on a piston.
I have been able to recrate this three times, and i dont think it is usually possible because it requires removing the portal frames using giant red mushrooms.
I resolved the issue. By switching to an older version and changing the language, then re-updating and going back to 1.14, all the languages came back
sorry i didn't see that one before when i looked