Nintendo continues its train of minor fixes to the 10.x.x line of system software. This time, it isn't just stability mentioned in the patch notes. Nintendo has fixed a prior issue where newly synced Switch Pro Controllers would operate with incorrect analogue stick inputs, which is now resolved thanks to the newly-released firmware version 10.0.2. Other than that, there's the standard stability improvements hidden within the update, per usual.

Ver. 10.0.2 (Released April 29, 2020)
General system stability improvements to enhance the user's experience, including a solution for the following:
We have fixed an issue where a Nintendo Switch console with system menu version 10.0.0 or 10.0.1 does not set up a new Nintendo Switch Pro Controller, sometimes causing incorrect joystick control.

Source

 

[Nemix77]

Okay, this firmware worked wonders for my drifting left analog stick on my Pro Controller.

I still plan on changing the left analog stick's internals but for now the problem seems resolved via firmware 10.0.2!