Difficult to describe, but very easy to reproduce and understand.
/tellraw @a {"text":"aaaaaaaa","obfuscated":true}
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Confirmed for 1.13-pre7.
It also appears that the characterset is also much more limited now. In previous versions you would see many accented and other unusual characters appear as the obfuscated text. Since this change it seems to only use non-accented alphanumerics.
Here's a screenshot from 1.12.
[media]@unknown aaaa does for instance include ââââ. But previously it was certainly more random and fewer characters are used in general. But that is a different bug, you can create a new ticket for that.
New bug raised: MC-133260
It seems that some lines differ, while others do not. I recorded a clip in slow motion, which should help show what I'm talking about. You can see it in the clip here:
[media]