As the title says when certain seeds are used the world wont generate at all, freezing the game in the loading world screen. This happens of multiple snapshots including the latest one. Still happens after a clean install. Here is one of the dozens i have come by so far: 2546895830750809496
(EDIT) Seems like its not seed related as every world crashes for me now because of ruins apparently not loading correctly
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Looks like MC-126241.
Also, I already reported the missing ruins files in MC-129745.
This is MC-125134
Attach a crash report; these can be found in
%appdata%\.minecraft\crash-reports.