Error: (0 , h.requestMetadata) is not a function

• Etcher version: 1.18.13 - 1.19.3
• Operating system and architecture: NixOS, x86_64-linux
• Image flashed: Arbitrary image
• What do you think should have happened: Image selected successfully, being able to select target
• What happened: Can't select any image
• Do you see any meaningful error information in the DevTools? No, same error as above.

In Nixpkgs we package Etcher on the basis of the official deb. The procedure no longer works as of 1.18.13.

Likely a continuation of #4138. Probably that issue should be reopened? @dfunckt