The source of the dice is never mentioned in The Last Jedi, so why do they have a history at all, unless there are plans for the story to be known?
The fact that Han Solo won the ship from Lando Calrissian is canon, it’s mentioned in The Empire Strikes Back, but the details as to how have previously only been available through non-canon sources.
Traditionally, the story of how Han Solo won the Millennium Falcon has involved a blackjack like card game called Sabacc, but the official story is that the two were playing a dice-based variant called Corellian Spike.
It’s possible Lucasfilm decided to make the dice, which have been there from the beginning, hanging up on unremarked on in Star Wars: A New Hope, a focal point in The Last Jedi so that fans who never noticed them before will be familiar with them when they are referenced again.