You are not able to feed the Pokémon the berries with an error "Walk closer to interact with this Gym". For the Pokémon sitting on gym prior to the latest update, "go to gym" is not functioning at all.
App frequently crashes, especially on highly traffic area when you access gym. Once I spent almost an hour for a RAID BATTLE and always got satellite error and App crashed when the timer ticked to zero, and lost my daily raid pass when boss Pokémon disappeared.
You really need to have a good app development team and QA team! How could this release pass UAT test and published live?
Yufei0406 about Pokémon GO, v1.39.0