Same problem with the last update except that after the download, import stop at 0% and the game show the message "download failed".
So i can't download this map neither on PC nor Nintendo Switch.
Small update :
If I try to download the pack, go to the settings menu and quit this menu the game show this screen. I'm completely stuck until I leave the game via the home menu. Not a freeze ( the background world continues to move ) but update is not progressing and stay at 0%.
With Windows 10 version this screen appear less than 1 second and i'm returned to the settings menu ( so i can't quit it )
[media]I didn't manage to crossplay with one account but once you bought and download Minecraft you can change the Xbox Live account.
1 ) Download/buy Minecraft for Windows 10 with your main Xbox Live account
2 ) Create an other Xbox Live account
3 ) Switch to this account
Solved with latest update