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[Star Wars] Why didn't R2D2 recognize Yoda in ESB?

This has likely been asked here before but a quick search yielded no results. How come R2D2, who met Yoda many times during the clone wars I'm sure, not recognize him and let Luke know that the little green creature was Yoda??
gpt
He did recognize him, he knew Luke had basic Jedi training from Obi-Wan, and he knew Yoda well enough to let Yoda take the lead, and even play along with him, when he was introducing himself to Luke.  He and Yoda were probably giggling about the lantern thing when Luke wasn't around.