Its Dec 27, 2019 on a PS4 with Bedrock and I am having an identical issue to what I see in the OPs screenshots.
I purchase content and it will not download. (I'm new here and I hope I'm doing this right after reading instructions about posting bugs)
Its not just the loading bar that is broke. I get error messages saying I can't download because I do not have enough space and I have plenty of space.
I ended up deleting a bunch of saves, and ruined a bunch of my worlds so I just got rid of all but a couple, I dropped some of my texture packs and even my mashup packs and it STILL gives me errors that I don't have enough space to download my purchased content.
I'm frustrated, but trying to be patient. I WILL get all this content and the updates I have purchased eventually, right?
I have it fixed! I uninstalled everything, in a fit of desperation. Whatever errors there were went away when I reinstalled. I lost some user created worlds, but I can make new worlds and I can now download my texture packs ect. All is well with the minecraft world.
Thank you for all the help!