Nested unordered lists don't work

[RoadrunnerWMC]

Describe the bug
Nested unordered lists don't seem to work correctly.

To Reproduce

* AAA
* BBB
* CCC
    * DDD
    * EEE
* FFF

Expected behavior
The page should show an unordered list containing items AAA, BBB, CCC, and FFF, and a nested unordered list under item CCC containing items DDD and EEE.

Screenshots
Current (incorrect) Idyll output for the above markdown:

For comparison, here's Jekyll's (correct) output for the same markdown:

I also checked this in GitHub's markdown readme renderer, and it's the same as Jekyll's.

Desktop (please complete the following information):

• OS: KDE Neon 5.19 (Ubuntu 18.04)
• Chromium
• 83.0.4103.61 (Official Build)

Additional context
Based on the structure of the HTML output, Idyll seems to interpret this example as three separate top-level lists: (AAA, BBB, CCC), (DDD), (EEE, FFF).

I tried varying the indentation and the bullet characters; this didn't seem to change anything.