When I initiate a world download of either a backup or the current realm state the download makes it to around 3.8-4GB (a 4.3GB world) before the download meter disappears and a blank client window where the meter used to be positioned sits on-screen indefinitely. I have to eventually close the client because nothing happens.

Edit 1: Proof of community interest: https://www.reddit.com/r/realms/comments/fchusy/bedrock_this_occurs_right_before_my_world_is/