Ultimate Edition of Minecraft Dungeons is buyable when all DLCs are owned

The bug:
The Ultimate Edition bundle of Minecraft Dungeons does not show up as "Owned" in the DLC tab of the Launcher, despite the user already owning it.

Observed behavior:
The "Buy now" button for the Ultimate Edition bundle still appears in the DLC tab, while each individual DLC appears as "Owned".

Expected behavior:
After purchasing the Ultimate Edition bundle, it should display as "Owned" in the DLC tab of the Launcher.

Note:
The website checkout works as intended, taking the user directly to the checkout page when attempting to purchase the bundle again.