Issue reading light level and pin at the same time

[microbit-mark]

micro:bit support: 22530 and 23067
Describe the bug
When reading light level and pin over serial in the same program, readings become eratic. Light level reads 0-255, but the Pin should read 0-1023, but instead we get the majority of readings at 255

To Reproduce
Steps to reproduce the behavior:

1. Go to 'https://makecode.microbit.org/_UqL8yYVj9MyM' and flash program
2. Connect Pin0 to 3V, reading on Pin0 should be 1023
3. Read serial data out and see that the majority of readings are 255

Expected behavior
Pin data should read from 0-1023

Additional info,

Have tried recreating this in the DAL see
Archive.zip but can't get a reproducer

[martinwork]

Related? lancaster-university/microbit-dal#448

[martinwork]

This repros without MakeCode if you read repeatedly and often, say 100Hz. There's a full 100% reading about every 0.05 seconds, with the ones between being 25%.

[abchatra]

This is tracked in the DAL repo. Closing here.