flutter_web: 1.15.2
Chrome: 80.0.3987.122
macOS: Mojave 10.14.6
VSCode: 1.42.1

Ensure web is enabled
Create a new project (no changes required)
Set the breakpoint any where
Set the device to "Chrome (Web)" & Start debugging

Observation:

1. Chrome shows no page
2. Breakpoint (if any) not hit

Switch to flutter web 1.15.1
Open Same Project created above
Set the breakpoint any where
Set the device to "Chrome (Web)" & Start debugging

Observation:

1. Chrome loads page correctly
2. Breakpoint hit