move gets double question mark though all moves allow mate in 1

[joriki]

Exact URL of where the bug happened

https://lichess.org/sGXP3wy0/black#41

Steps to reproduce the bug

Unfortunately I can’t reproduce the bug. When I open the URL in a new tab, the question marks are no longer displayed. The problem occurred when I opened the analysis board after the game, requested a computer analysis, turned on local evaluation and browsed the moves (I don’t remember in which order).

What did you expect to happen?

When all moves allow mate in 1, I would have expected them all to be treated equally, rather than one being preferred over another.

What happened instead?

Despite the lack of alternatives, 21. @D2 is rated with a double question mark. The analysis says "Checkmate is now unavoidable. Bd2 was best." even though Bd2 allows the same mates in 1 (and in fact allows an additional mate in 1).

Operating system

mac OS 14.3.1 (23D60)

Browser and version (or alternate access method)

Firefox 126.0

Additional information

This screenshot shows the double question mark both on the board and in the move analysis: