This continues to not be intentional, and not a bug.
— Michael (@SciresM) October 23, 2020
It is unchanged in Sword/Shield 1.3.0, there is still a 3% chance of the re-roll boost from having caught lots of pokemon taking effect.
The relevant function is at .text + 0xD30E40 for Sword 1.3.0. https://t.co/qlAGHEvqrd