unable to decode prepared statement

In the course of investigating MB-19659, I have run into a problem with prepared statements. I thought this bug had been fixed.

I installed 2566 on a machine, and ran statement curl http://172.23.123.102:8093/query/service -d "statement=prepare select count(1) from default where a = ? and b = ?"

Based on the results, I assembled this request

curl http://172.23.123.100:8093/query/service -H "Content-Type: application/json" -d '

{ "encoded_plan": "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", "prepared": "d1db3316-6b72-48f8-9248-00242de94255", "args":["A1","B2"]}

’

This request failed:

{
"requestID": "c339e667-7578-4744-9115-68e2c801b9a1",
"errors": [

{ "code": 4070, "msg": "Unable to decode prepared statement - cause: Unrecognizable prepared statement - cause: JSON unmarshalling error: json: cannot unmarshal bool into Go value of type value.Value" }

],
"status": "fatal",
"metrics":

{ "elapsedTime": "78.352µs", "executionTime": "76.518µs", "resultCount": 0, "resultSize": 0, "errorCount": 1 }

}