TypeMismatch in functional results

This example taken form the original API documentation for StackWalker compiles without any warnung and works well with command line Compilers.
But it shows an errort "`Type mismatch: cannot convert from Object to Optional`" in the java editor.

```
StackWalker walker = StackWalker.getInstance(Option.RETAIN_CLASS_REFERENCE);
Optional> walk2 = walker.walk(s -> s.map(StackFrame::getDeclaringClass).findFirst());

```
Eclipse Version 2025-06 (4.36.0)
Build id: 20250605-1316
On Windows 10
With Eclipse builtin Java Version