afs commented on issue #3455:
URL: https://github.com/apache/jena/issues/3455#issuecomment-3316154730
While the filter expression `FILTER(STRSTARTS(?x, "A"))` or
`FILTER(STRSTARTS(?x, "A") && BOUND(?x))`
becomes part of the left join (c.f. SQL `ON`) (top level FILTER in the RHS
of OPTIONAL is a special case), the vcariable is onl inscope to the expression.
Add a layer of `{}` to move the FILTER to be RHS only, before the left join.
```
OPTIONAL { {
FILTER(STRSTARTS(?x, "A") && BOUND(?x))
BIND(?x as ?z1)
} }
```
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