Multiple content-script not working

[imagents]

Version

6.0.1

Current Behavior

If you inject multiple content-script into a page with the first one declare onMessage('A) and the second one with no onMessage declaration. When you sendMessage from background. The background will throw an error "No handler registered in 'content-script' to accept messages with A".
However if you switch the first one and second one position in manifest. It works.

Expected Behavior

Both onMessage declared in content-script will work.

Steps To Reproduce

Just create two content-script and inject into the same page

Anything else?

No response

[SaschaLucius]

I face the same problem when using WXT with webext-bridge.

If I define two content scripts and try to message between them, I always get:
Error sending xxxxx message: Error: [webext-bridge] No handler registered in 'content-script' to accept messages with id 'xxxxx'