I heard anecdotaly from someone who worked at Rakuten that the shift to English caused issues in meetings, not because of language problems but because English doesn't designate social structure like Japanese.

In Japanese, you conjugate verbs differently depending on if the person is more or less senior than you, as well as other language changes. Apparently when they switched to English it caused people to take offense that lower people were being rude. Also, people also struggled to identify who was at what level, something that is super easy listening in to a Japanese conversation.

Not sure how involved the person I heard this from was, but it makes a good story!