I was playing "the cave"(by Mr3DAlien) in realms and I faced a challenge where I could not make a stone pickaxe(it was not shown on the crafting table nor does it appear when I arrange the blocks in the positions of the recipe) although I did have all the ingredients. I went on youtube and saw this tutorial that there was a custom advancement for this game that would require some certain actions to make a stone pickaxe, but to discover that you need to be in the advancement screen. I pressed L, and the advancement screen showed "there's nothing to see here", and I also saw a few other people commenting below the video saying they could not access the advancement screen either. I restarted the game, did exactly what the video did, broke the same blocks, but no achievement was shown on my screen. And according to the people who commented below the video, they also could not access the advancement screen even after following the video.
I wouldn't have been reporting this issue if I could just simply follow the video and play along. But I've followed every step/advancement required for a stone pickaxe(including throwing 64 cobblestones onto a wood pickaxe), but it did not work, which made the game totally unplayable. I really wish this problem could be fixed since the game seems really fun and so that the people who want to play it could actually get to play this game.