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Value is cleared in getValidRules() when changing string operators in QueryBuilder

When using the QueryBuilder in React, changing certain string-based operators (e.g., startsWith to doesNotStartWith, contains to doesNotContain) causes the value to be removed in the output from getValidRules().
However, the value still appears in the UI under the "Value" box, creating a mismatch between what's displayed and what is returned programmatically.
This issue does not occur when changing numerical comparison operators like equal or greaterThan, where the value is preserved both in UI and in code.
Simple Sample: https://stackblitz.com/edit/react-kcvpf4cl-27liyiwy?file=index.js,package.json

Replication Procedure
  • Run  the sample 
  • Click the button , ( you can see the alert message ) 
  • Change to start Width to doesNotStartWith.
  • And then click the button ( see the issue )

Expected Output:
The value entered previously should be retained and available in the output of getValidRules() when changing string operators.

Current Output:
The value disappears from the returned rules (getValidRules()), while it is still visible in the UI input field.