Description

With "Use theme styles" turned off, the Latest Posts and Latest Comments blocks don't look great.

Step-by-step reproduction instructions

1. Go to Posts → Add New.
2. Go to Preferences → Appearance and turn off "Use theme styles".
3. Insert a Latest Posts and Latest Comments block.
4. Select the Latest Comments block and turn off "Display avatar", "Display date", and "Display excerpt".

Expected behaviour

I would expect both blocks to appear as regular unstyled unordered lists, like so.

Actual behaviour

They don't look like lists.