Windows 11 Enterprise.
64-bit operating systems.
java : (build 1.8.0_361-b09).
Minecraft Java Edition 1.20.1 version.
I used OptiFine mode. ("preview_OptiFine_1.20.1_HD_U_I5_pre8", downloaded from the official website)
I am unable to fully download a backup of Realm with Datapack added.
I think it's probably because the name of the Datapack I added to Realm was written in Korean(한글). When I download a backup of Realms, I receive a backup file that is missing from Datapack which had Korean written on it. When I run it, a lot of things go missing, including Advancements. This can be a fatal problem for my Realm server. Download failure does not display the error number.
I'm not sure how technically difficult it is to solve this problem, so I'm not sure what additional information I need to provide, but I'm willing to provide as much information as I can about this problem.
The attached photo was captured on the screen downloading the latest version of Realms.
I'm sorry if there could be unskilled English using a translator.