The cursor disappears inside the game and out of the game while running Minecraft on Mac OS. The issue started in 1.17 and persists in 1.17.1.

After some additional testing, it appears that the cursor does not reappear when I Command+Tab or Control+Left Arrow to another app while the cursor is invisible in-game, and once I've done this, the cursor does not become visible in-game again when I return to the game and open a menu or UI that would normally display it. If I press escape to go to the menu or open a UI such as the crafting table or chest before switching to another desktop or app, the cursor stays visible. I have also discovered that I can bring the cursor back both in and out of game by opening a UI in the game, moving my cursor to the top of the screen to show the OS menubar, and left-clicking once.