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I went back hour by hour in vrabi and the jaggies definitely started today and appear to be MOSTLY EN streams.
Haachama also got them, but I'm gonna guess because she was getting a lot of EN viewers.
JP graphs looked smooth all past 24 hours (although Patra got wave botted for her ASMR and Subaru had a super fucked up graph and "Ohayama" whoever the fuck that is has rollercoaster engine bots). The first blocky jaggy streams are Shiori and Haachama.