For some reason, occasionally after changing a resource pack on a real, if you attempt to download the world, it will instantly pop up with "an error occurred" what error you may ask? It does not specify. This is preventing me from downloading the current world my realm is running, in which an addon is playing up and needs tweaking. But this can only be done on a world download, as editing an addon file which is already on a realm does not work. This bug is very random, it happens sometimes but then other times it wont.

Steps to reproduce
1. Load Minecraft
2. Click on the pencil icon next to realm
3. Select a world
4. Attempt to download the world, you may see "Initializing download" for a split second then "an error occurred"

Here is a video of the glitch in action https://youtu.be/aCCzeC8x-w4