A couple of Korats & a Manx kitten in class judging at the 2018 CFA International Cat Show held in Cleveland, Ohio, USA.
The judge is Rachel Anger.
Manx also have long & short hair variants and are also grouped with the other shorthairs for shows Thought I'd see more Manx kittens, catalog lists 3 entries but I saw only this one male kitten.
As Rachel mentions, litters of Manx can have tailless kittens, fully tailed kittens and everything in between.