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Submitting BUR Form causes CookieOverflow exception

Posted under Bugs & Features

can't submit my first BUR here because of this server error.
I've tried deleting my _danbooru2_session cookie, logging out and back in, but the BUR creation always failed with this message:

An unexpected error has occurred.

Details: ActionDispatch::Cookies::CookieOverflow exception raised.

app/logical/rack_server_timing.rb:19:in 'RackServerTiming#call'

has anyone else run into this?

shortened it and now I'm getting 502 Bad Gateway message from Cloudflare repeatedtly when I try to submit. is this pure coincidence or did I break something server-side?

the Help: How to make a bulk update request guide at the top of the page said to write changes like this:

imply rabbit_tail -> tail

I followed their example exactly, and wrote many lines like this. wouldn't really expect any syntax errors. im a bit lost.

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