After 26C, The EXTERNAL REST tool not passing/drops actual parameter value

Summary:

The supervisory agent which i created in 26A, it was working correctly till 26B. Post upgrade to 26C, the GET SO payload is not passing actual user value in the parameter and its considering variable/parameter as actual value and resulting in no results.

If i hardcode the value of SO in tool then its fetching the details properly. im using rest version 4.

Please help resolving this.

Resource path:

"query_dict": {
"q": "OrderNumber IN '{pOrderNumber}' AND SubmittedFlag=true AND OpenFlag=true",
"expand": "lines,holds,billToCustomer,shipToCustomer,totals,attachments,lines.holds",
"onlyData": true
},

Content (please ensure you mask any confidential information):