My game is locked and inventory dissapears

Within the game, when I lock the screen or it automatically locks, it stays on the white screen when I unlock my phone, even if I get out and re-enter the app, the Minecraft logo appears and it is still not loaded, it's annoying because when I am in the middle of the game, I have to start the app again, and now it turns out that since I was playing, it got blocked and everything in my inventory was deleted, it was annoying and saddened since I had experience and good objects, it felt like it started again after having advanced a lot, please I need you to fix that, it has been on my mobile since version 1.13 (it is a Xiaomi Mi A1) ☹️