Lots of 400 errors in server log

I am getting a lot of 400 error messages in the server logs, which could be due to a bad bot, but they are all similar messages but the hash/id changes on each message:

/misc/style-variation?reset=1&t=1721622876%2C3995f657e50f2d154babc457c00bd09e HTTP/1.0

Any ideas what can be causing this?

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