I have tested this in two worlds, a new one made in the current version of Beta, and one that is a bit older, both are currently in 1.16.100.50. in both these worlds I haven't been able to find many diamonds at all...it seems the current patch has some sort of diamond spawning bug.
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Cleaning up old tickets: This ticket had been set to 'Awaiting Response', but has not received a response from the reporter (~3 months+) so is being closed as Incomplete. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines which includes steps to reproduce the problem.
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Is this still an issue in the latest version? If so, could you provide the world seed?