[MCPE-36670] Nintendo Switch: Not Enough Space when trying to download Marketplace content or realm world

Note from [Mod] GoldenHelmet

This issue seems to be caused by a hidden 2 GB per user profile storage limit on save data. It is not clear whether this limit is imposed by Minecraft or by the Switch. Additionally, the amount of data use shown within Minecraft in the Settings>Storage menu may not match the amount of data use shown for Minecraft in the Switch's Settings>Data Management>Save Data Management menu. For some users, the Switch still shows 2 GB of Minecraft save data even after the user deletes all worlds, packs, templates, and cached data from Minecraft's storage menu.

The following workarounds have been shared in comments (pinned below):

Close Minecraft and restart it.
Delete unused and no-longer-needed content from within Minecraft, through the Settings>Storage menu.
Delete the Minecraft save data through the Switch's Data Management menu. This should be a last resort as it will delete everything saved locally in the profile. However, Marketplace purchases will be able to be downloaded again, and worlds uploaded to a realm will be able to be downloaded again.

When trying to download a world that I've purchased I'm now getting the error "Not Enough Space - 134 MB - You do not have enough space available on your device to download the..." However, I have over 10 GB on my system, and over 12 GB on a SD card. It happens with every world we've bought, so it's somewhat frustrating; especially when downloading skin packs seems to work fine every time.