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Error or Blunder (Forced checkmate)

Reference the last moves of the game : http://en.lichess.org/iWDuQ1su

When there is a big jump in an evaluation number, I believe it is more of a blunder, than an error.

The evaluation : -7.31 → -53.34 should have been called a blunder, yet it was called a Mistake. On move 25. ... (-53.33 → Mate in 9) Checkmate was unavoidable.
On move 26.,the evaluation drops because of : Lost forced checkmate sequence. The evaluation should have been called a Blunder, yet it was also only called as an error (Mate in 9 → -7.05)

Can this be a Stockfish evaluation bug?

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