Sniffer eggs ignore the command /gamerule randomtickspeed. Meaning they won't hatch faster in higher values and will still hatch as normal when set to 0.
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Thank you for your report!
We're tracking this issue in MC-261250, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as invalid. Please take a look at the parent ticket (MC-261250) and see if an explanation is provided there in the description of the ticket or in the comments for why this issue is invalid.
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This seems to be invalid/feature request according to MC-261250