I don’t know if this is a bug or purposeful but if my container has an ‘image’ background with a card, the description does NOT show up on the card label:
If you try several alternative settings in settings-appearance, you will find various strange appearances happening again. Not appearing doesn’t mean it doesn’t exist. In your case, it’s a text color issue. If you try different setting adjustments, the background color of the card becomes transparent instead. In my opinion, this is a bug.
I was just asking to confirm that the way you highlight the text where you put a question mark indicates that the object is present but just not visible due to a color issue.
After trying again, I found even more anomalies, caused by differences in the appearance settings. This is a bug.