Make Blog Posts Macro render Date Picker in Blog Posts Texts possible

Blog Post macro renders Blog Posts Date Picker values as empty strings.

1. Create a Blog Entry with //date-picker in the blog Text
2. Publish
3. Read in a Blog Stream: no date-picker value is rendered
4. Date Picker Value is perfectly well in the Entry itself.

Edit: This is also present in Blog Posts Macro:

1. Create a Blog Entry with //date-picker in the blog Text
2. Publish
3. Insert the Blog Posts Macro
4. Select Excerpt under Content Type to Display
5. The //date picker is not rendered