Alt key cannot be used in conjuction with A key

Holding down Alt key will make A key unusable.

Environment: Win 10; I use Left Alt for sneak and A for strafing left, sneaking with Left Alt disables me from strafing left. The issue exists on Right Alt too.

Cannot find any existing report via search (innocent)

Does not apply when A is pressed before Alt

To reproduce: Map one of Alt (the issue exists on either one) and key A to, for example:

• Sprint or Sneak & Move Forward
• Jump a& Sneak (when in creative, 'shifts' without descending)

Assumption: Alt+A is some sort of (useless?) combo I am not aware of.