Day headers showing month numbers instead of day names in Month view

In the desktop app Month view, the day-of-the-week headers (Mon-Sun) are missing and replaced by numbers (4, 5, 6, 7, 8, 9, 10). This appears to be a UI bug where month indices are being displayed instead of day names. The user provided a screenshot showing this behavior for April 2026. I want to see the actual day names so I know what day it is.