Missing taint flow

**Description of the false positive**

**Code samples or links to source code**

**URL to the alert on GitHub code scanning (optional)**

I use the following query analysis code:
```

import python
import semmle.python.dataflow.new.DataFlow
import semmle.python.dataflow.new.TaintTracking
import semmle.python.dataflow.new.RemoteFlowSources
import semmle.python.Concepts
import semmle.python.ApiGraphs
module BackwardDataFlowConfiguration implements DataFlow::ConfigSig {
predicate isSource(DataFlow::Node source) {
source instanceof DataFlow::ExprNode
and source.asExpr() instanceof Name
and source.getLocation().getFile().getRelativePath() = "lollms/server/endpoints/lollms_personalities_infos.py"
and exists(Name n |
n = source.asExpr() and n.getId() = "category")

and source.getLocation().getStartLine() = 330

}

predicate isSink(DataFlow::Node sink) {
sink instanceof DataFlow::Node
}
}

module BackwardDataFlow = TaintTracking::Global;

from DataFlow::Node begin, DataFlow::Node end
where BackwardDataFlow::flow(begin, end)
select
begin,
"$@,$@"
,
begin.getLocation(),
"begin location"
,
end.getLocation(),
"end location"

```
this is the results:
Starting from the `category` variable I specified, I tried to find all the nodes that it could potentially flow to. However, I only ended up with six results, which are marked in the figure above. Apparently, the `package_full_path` in the row where the sixth point is located is also a node that category could flow to, but the results don't reflect this. Why is that? Thank you for your answer!