I had a similar incident.
I am using an old garden blower vac, on suction to cool the beans. I cut down the tube to make it shorter, fitted a bucket, and the sieve sits inside the bucket.
One time I was cooling the beans and the sieve swivelled inside the bucket, and the vac sucked in a handful of beans. Man, it just pulversied the beans into tiny fragments and spat them out everywhere, like a sand blaster!! Still continually finding bits of beans all over the place!!