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Bug Report: Generic ValueAccessor fails to insert leaf nodes and to locate nodes of uncached types

Bug Report: Generic ValueAccessor fails to insert leaf nodes and to locate nodes of uncached types: a task in LegoFlow-SWE (Harbor dataset). Affected Component The generic ValueAccessor (the flexible accessor that can be used with any tree configuration) does not correctly handle leaf insertion…

The task

**Affected Component** The generic `ValueAccessor` (the flexible accessor that can be used with any tree configuration) does not correctly handle leaf insertion and node lookup. Specialized accessors built for the default tree configuration are not affected.

Part of Lego-X/LegoFlow-SWE.