Using a Steam Link device to cast to a second monitor and using certain services such as Netflix or Hulu, videos show as black, empty screen. Sound still plays but no video. Other services such as Youtube show videos just fine.
By comparison, using Firefox, both Netflix and Hulu videos show up without any issues. The Windows 10 Netflix/Hulu apps do have the same issue so maybe the issue lies with Chromium rather than Edge?
Might be useful if someone owning a similar device such as a Chromecast could try to reproduce this.