Spitfire Symphony Orchestra: contrabass tuba tenuto notes

For my fellow SSO devotees, is anyone else hearing semitone jumps when playing contrabass (C) tuba tenuto (UACC 50) notes of very short duration?

In the following capture, I’m playing first the Long variant, followed by the Tenuto variant. Note the upward semitone when I tap the keys on the Tenuto setting.

I was about to file a bug with Spitfire, but I’m wondering whether this is simply a characteristic of the instrument. It doesn’t happen with every note, and I can’t replicate the problem on the F tuba. Does anyone know whether this is simply a known quality of real contrabass tubas?

I hear both notes near the end, there. Like the note you play is coming out only a grace note to the semitone above. Definitely sounds like a malfunction of some kind. A real tuba can’t change pitch instantaneously like that.

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