arne-bdt opened a new issue, #3455:
URL: https://github.com/apache/jena/issues/3455
### Version
5.6.0-SNAPSHOT
### What happened?
The query:
```SPARQL
SELECT ?x ?y ?z1 ?z2
WHERE
{
VALUES ?x { "A" "B" }
BIND(?x as ?y)
OPTIONAL {
FILTER(STRSTARTS(?x, "A"))
BIND(?x as ?z1)
}
OPTIONAL {
FILTER(STRSTARTS(?x, "A"))
BIND("starts with A" as ?z2)
}
}
```
returns
```TSV
?x ?y ?z1 ?z2
"A" "A" "starts with A"
"B" "B"
```
But I would expect ?z1 to be "A" in the first row:
```TSV
?x ?y ?z1 ?z2
"A" "A" "A" "starts with A"
"B" "B"
```
Within the OPTIONAL block, I may use any new expression like I demonstrated
with ?z2 in BIND but no existing variable which I tried with ?z1.
Is this a bug or not?
### Relevant output and stacktrace
```shell
```
### Are you interested in making a pull request?
Maybe
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