Color changes while watching Apple TV+ programming

My equipment:

• Apple TV 4K
• LG OLED B2
• Sonos Playbar

I’m experiencing something very strange while watching Apple TV+ content such as Ted Lasso, Shrinking, etc. Color will start out vibrant with good contrast and color, then all of a sudden the picture becomes low contrast with muted colors. This does not happen while watching programs on YouTube TV, Disney+, Netflix, and others. The color starts good and stays good while watching programs on these apps. Even navigating around the Apple TV app is ok, but once I start watching a show this color changes happens.

Here are my current color settings:

• Apple TV
  • Format: 4K Dolby Vision
  • Match Content: Frame Rate and Dynamic Range both on
  • HDMI connection test came back OK
• LG OLED B2
  • Picture Mode: Cinema Home
  • Filmaker Mode: I’ve tried both on and off, makes no difference
  • HDMI: I’m using port 3 from the Apple TV 4K
  • Audio: Connected to Sonos Playbar via optical output