Rapid Descent When Lowering Altitude Setting
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I've had this behavior happen a few times, and was wondering if it's a bug, RW behavior, or "pilot error":
Say I'm descending on a fairly complex STAR using LNAV and V/S mode, with A/T. The plane has almost reached my dialed-in altitude setting for a STAR constraint, the V/S value on the MCP has changed from my previously-set V/S speed to blank, and it's starting to level off. If right then I dial a lower altitude for the next STAR constraint, the plane immediately starts to rapidly descend at sometimes over 2300 ft/min. I have to dial back the V/S setting to something more manageable.
Is anyone else able to replicate this? I can post a Youtube video of this if needed.