Ken Burns causes 360° background in Compound Clips to jump around in Final Cut Pro for Mac

TL;DR: When you apply a Ken Burns zoom-in to a standard 4K 2D Compound Clip that inside of it contains a 360° Compound Clip, the 360° Compound Clip is rotated unexpectedly.

Longer explanation: In Final Cut Pro (version 11.1.1) for Mac, if I have a retimed Compound Clip that is reversed (so -100% speed) to which I have applied a Ken Burns to create a eased-in zoom-in effect. But the problem is that the background jumps around within that Compound Clip after the Ken Burns crop is applied. This also happens if you apply the Ken Burns to an Adjustment Clip above the Compound Clip.

The Compound Clip contains a second Compound Clip that is a 360° Compound Clip (this is the background that jumps around), where I have used the Orientation parameters to frame it correctly behind the keyed out actor (who herself is placed inside of a third Compound Clip where the blue screen was keyed out).

To be clear: the "MASTER 2" timeline is a standard 2D timeline, as well as the Compound Clip inside of it that has the Ken Burns applied, as well as the actor's Compound Clip, so the only 360° footage/part of this setup is the background 360° Compound Clip.

The simple workaround would be to use the Scale parameter and just keyframe it to create to zoom-in effect, but the problem is that Final Cut Pro doesn't allowed eased keyframes for the Scale parameter. So any ideas how to solve this?

GIF demonstrating the bug.

The Orientation parameter changes when a Ken Burns effect is applied to the Compound Clip it is placed inside of (so the Ken Burns effect is not applied to this 360 degree layer itself!).

[Edited by Moderator]