Steps to replicate the issue (include links if applicable):

• Go on Dagbani Wikipedia, in a day of month less or equal than 12
• In visual mode edit, insert the function call {{#function:Z20780||Z1002}}: it should display the current day in English

What happens?:
If today the date is dd-mm-yyyy, the blank parameter is instead interpreted as mm-dd-yyyy.

For example, the following screenshot was taken the day 6 September 2025:

This could be linked with the fact that Dagbani uses the mm-dd-yyyy format, so the reader function Z23990 interprets the input in mm-dd-yyyy format if ambiguous.

What should have happened instead?:
The blank parameter should have been interpreted as the correct current date.