I've tried to search the docs and forum but nothing is posted about this non-viewable area around the screen when you set something to 0,0 position.
When I create an object and position it at 0,0, 42 pixels on the left and 22 pixels at the top are off screen. If I set the translation = [42,22] it's perfectly aligned with the left/top edges of my tv
Sounds like the overscan demon strikes again. Someday we'll kill it for good.
look here for typical amounts https://en.wikipedia.org/wiki/Overscan#Overscan_amounts
In your case we see 2-3% (depending if you are in 720 or 1080).
My rule of thumb is, I assume that 3-5% on each side are LIKELY to be lost due to overscan and plan accordingly. Meaning, don't put stuff you care about there - but keep in mind on some TVs those edges will be visible so don't leave them contrastingly empty either
Yes, you should be ready screen fringes maybe get be chewed away on screen. There is no way to know if that's happening, so don't put important stuff there. This btw is the case developing for tv on any platform