Return to the place where you got the broom. Stars will be shining there. Leave the broom there, and you'll be able to move around the world.
There are no stars where I picked the broom up, the only stars are where the notice board is and the one where filch says return brooms to pantry. Neither of these give the option to put the broom down
Unfortunately, we can't reproduce your bug. It's possible the star animation isn't playing. Try flying to this spot and pressing the action button.
Im on android so im not sure what the interaction button would be, Ive tried attaching my own screenshot but I keep getting a turnstile error
