Python: Local/Global dataflow analysis not tracing class field?

## Python
```python
class Cls:
def __init__(self) -> None:
self.field = 1
def __init__(self, num) -> None:
self.field = num
def print(self) -> None:
print(self.field)

if __name__ == '__main__':
var1 = Cls(2)
var2 = var1
var2.field = 3
var1.print()
var1.field2 = 4
print(var2.field2)

```
## CodeQL
```codeql
import python
import semmle.python.ApiGraphs
import semmle.python.dataflow.new.DataFlow
import semmle.python.dataflow.new.TaintTracking

module MyConf implements DataFlow::ConfigSig {
predicate isSource(DataFlow::Node source) {
source.asExpr() instanceof IntegerLiteral
}
predicate isSink(DataFlow::Node sink) {
sink = API::builtin("print").getACall().getArg(0)
}
}

module MyFlow = DataFlow::Global;

from DataFlow::Node source, DataFlow::Node sink
where MyFlow::flow(source, sink)
select source, sink
```
## Output
|source|sink|
|-|-|
|1|`self.field` in line 7|
|2|`self.field` in line 7|
## Expected result
|source|sink|
|-|-|
|1|`self.field` in line 7|
|2|`self.field` in line 7|
|3|`self.field` in line 7|
|4|`self.field` in line 16|