There are mobs being born into the water including spiders is quite rare more can happen
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Cleaning up old tickets: This ticket has not been updated recently (~1 year+) so is being closed as Cannot Reproduce. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines.
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Spiders are spawning underwater on kelp and seagrass.
[media]Small simple testworld attached: