• Minecraft version 1.14.2
• CC: Tweaked version 1.83.1
• Forge version 26.0.32

Tab key work fine for MC (I can assign it to controls and work fine), but not when focused on computers. So I cant use autocomplete (I verify autocomplete is set to true), and cant write tabulation.

Also, I test with this program :
repeat a = {os.pullEvent("key")} print(unpack(a)) until false

It confirm that an event is fired when any key from my keyboard is pressed, excepted Tab (and Escape, as espected)

(I have a dell keyboard sk 8115 French AZERTY)

Same here. I think it may be something with Minecraft adding accessibility settings and navigating with Tab key.