I have a 9.7" iPad Pro and I was wondering if this bug exists in the 11" iPad Pro or new iPad Air. This issue has persisted since iPadOS 13 and possibly iPadOS 12 and I was expecting Apple to update the app to use the current Music Now-Playing panel but they haven't.
This is what the Playback-controls look like normally in the 25% Now-Playing-panel.

But if I collapse and expand the Now-Playing-panel the Playback-controls look like this.

However, while the Now-Playing-panel is visible, if I change the orientation, go to 50%/50% and back 25%, or switch back to the app from the desktop or a different app, the issue is fixed until I collapsed and expand Now-Playing-panel again.
This is what the Playback-controls look like normally in the 25% Now-Playing-panel.

But if I collapse and expand the Now-Playing-panel the Playback-controls look like this.

However, while the Now-Playing-panel is visible, if I change the orientation, go to 50%/50% and back 25%, or switch back to the app from the desktop or a different app, the issue is fixed until I collapsed and expand Now-Playing-panel again.