Description
The post date block text color are not visible for Afternoon, Twilight, Midnight variation and section style 5

Step-by-step reproduction instructions

1. Start by creating a new page or post.
2. Add a "Group" block and apply "Section Style 5" to it.
3. Within this group, insert a "Post Date" block.
4. Preview the page or post.

Expected behavior
The post date block text color should be visible across Afternoon, Twilight and Midnight themes.

Screenshots