Full games turning into trials (disc and digital)

contact official support to see what has happened.

I would say - with a 99.9% certainty - that there won't be a problem. Trials, where the full game is downloaded, but the game is limited to certain amount of time will convert to the full game, whether this via a disc or a digital purchase.

My digital Trial of Gears of War 4 changed to the full unlocked game - without any additional downloads when I purchased it this weekend. And a 10 hour trial of one of the FIFA games worked perfectly when my nephew bought the disc version and put the disc
in my console.

You shouldn't need to do the download again.

You will need to uninstall the trial version of the game. Then install the game from the disc.

The console picks up that you only have the trial version rights and not the full game of the disc.

Having the same issue except I'm trying to purchase the game digitally but it won't give me the option to. I only get install trial, then play trial. I've played from a disc version before and I'm past the level cap so the game prompts me every time to purchase
the full version, but again all I get is the option to play trial when I enter the Xbox games store.

Try removing the trial version of the game, and then reinstalling the game via the disc to be able to play the full game.