alishaaaqil opened a new issue, #2420:
URL: https://github.com/apache/incubator-kie-issues/issues/2420
### Describe the bug
A DMN decision with a collection result type returns a nested list when a
`for` expression returns a Context containing a single value per iteration.
For example, the result is `[["aa"], ["bb"], ["cc"]]` instead of `["aa",
"bb", "cc"]`. This can cause downstream filtering to return an empty list.
### Expected behavior
The decision should return a flat list:
```feel
["aa", "bb", "cc"]
```
### Actual behavior
The decision returns a list of singleton lists:
```feel
[["aa"], ["bb"], ["cc"]]
```
Downstream filtering consequently returns an empty list.
### How to reproduce
Create a DMN decision with a collection result type and a `for` expression
that returns a Context entry containing one value per iteration.
For example, the intended logic is equivalent to:
```feel
for x in ["a", "b", "c"]
return { value: x }.value
```
Evaluate the decision and inspect its result. The values are unexpectedly
wrapped in individual lists rather than returned as a flat list.
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