ECJ accepts Object as argument in a chain of calls when Javac rejects about incompatible types

I looked through the existing bugs but haven't found anything like this among similar bugs. This code is accepted by ECJ, but rejected by Javac:

```
class Y {
void foo(U uvw) {}
static Y bar(Z c) {
return new Y<>();
}
}
class Z {}
public class X {
static Z getZee() {
return new Z<>();
}
public static void main(String[] argv) {
Y.bar(getZee()).foo(new Object()); // Javac says "incompatible types: Object cannot be converted to CAP#1"
}
}
```

Copying @stephan-herrmann