The primary reason for this patch was to resolve a bug where certain players were unable to receive the Shiny Charm . Even if you had completed the Pokédex and met all requirements, the item sometimes wouldn't trigger. With 1.1.1 installed, affected players can simply speak to Professor Laventon in Galaxy Hall to claim their reward.
Beyond the Shiny Charm, the update included minor "other bug fixes" to improve general gameplay stability and online connectivity. Pokemon Legends Arceus -NSP--Update 1.1.1-.rar
Because Update 1.1.1 is incremental, it retains all the major "Daybreak" features introduced in 1.1.0: What's the daybreak update? : r/PokemonLegendsArceus The primary reason for this patch was to