Escaping Mix Paste Triggers Another Mix Paste Window

I use mix paste frequently with the Spectral Waveform view. I always open it with CTRL+Shift+V. Occasionally I'll want to cancel out, which I use the Escape key to do.

Frequently, the Mix Paste window will close, but another one will immediately trigger and open.

This happens frequently, and I've only ever had to click cancel twice; never more than two.

It's been happening since versions of 2019 and persists into todays release: 13.0.2.35

Windows 10, fully up to date as of 1/15/2020.