Audio Pitches Down/Up after opening an AUP3 project.

[chinakov]

Bug description

If the User has created a project with multiple audio clips, saves the project with an older version of Audacity, and then re-opens the project in the newest (3.5.1) version of Audacity - some of the clips may be pitched down/up for no reason at all.

Steps to reproduce

1. Launch Audacity
2. Open an old project, created with an earlier version of Audacity with Audacity 3.5.1
3. Observe some audio clips/tracks are pitched up/down.

Expected behavior

The clips should never be pitched up/down without user input.

Actual behavior

The clips are pitched/shifted.

Audacity Version

latest stable version (from audacityteam.org/download)

Operating system

Windows, macOS, Linux

Additional context

This is a placeholder ticket that I am fleshing out as I go, as I still can't find the reason for this to happen.