Are there any legitimate openings that turned out later to be forced mates?

I was curious if there are any openings for black or white that used to be legitimate responses, but were later analyzed by computers or humans to be a forced mate for the other player (like a mate in 15 or something.) And I am not talking about like the scholar's mate or fools mate or anything, because beginners might fall for them, but they are not openings used by masters.

I mean the opening for the responding side used to be considered a good response but was later found to be a blunder because there is a forced mate line.

Historically, no.

There are openings that were considered promising that now offer no more than a draw, if not a worse position, at the top levels. The King’s Gambit, for example, offers White no prospect of advantage against a prepared opening. Nonetheless, it remains playable below the master level.

mate in 15s are very very rare, and i think any mate that comes from an opening would be seen by players and thereby not used