[Bug]: tcgc, diagnostic, false positive on method with spread

[weidongxu-microsoft]

Describe the bug

The diagnostic is error and cannot be ignored.

TCGC appears to be wrong when the method body parameter got spread (or maybe only when there is 2 spread in body?).

error @azure-tools/typespec-client-generator-core/no-corresponding-method-param: Missing "completeRequest" method parameter in method "complete", when "completeRequest" must be sent to the service. Add a parameter named "completeRequest" to the method.
error @azure-tools/typespec-client-generator-core/no-corresponding-method-param: Missing "embedRequest" method parameter in method "embed", when "embedRequest" must be sent to the service. Add a parameter named "embedRequest" to the method.
error @azure-tools/typespec-client-generator-core/no-corresponding-method-param: Missing "embedRequest1" method parameter in method "embed", when "embedRequest1" must be sent to the service. Add a parameter named "embedRequest1" to the method.

log

full run on existing libs

Reproduction

source is
https://github.com/Azure/azure-rest-api-specs/blob/016b80ae90f5fabc1e572efabd3ecb1030d444c0/specification/ai/ModelClient/routes.tsp#L26
(it is not merged to main branch, PR Azure/azure-rest-api-specs#28438)

SDK at https://github.com/Azure/azure-sdk-for-java/tree/5e07b10d9b04fe8c73a4ee6c78f8aeb9786e0543/sdk/ai/azure-ai-inference

Checklist

• Follow our Code of Conduct
• Check that this issue is about the Azure libraries for typespec. For bug in the typespec language or core libraries file it in the TypeSpec repo
• Check that there isn't already an issue that request the same bug to avoid creating a duplicate.
• The provided reproduction is a minimal reproducible example of the bug.

[tadelesh]

The root cause is from: microsoft/typespec#4757. Suggestion: refine the spec definition since spread additional properties model in body is meaningless.

[weidongxu-microsoft]

Asking service to update the tsp https://github.com/Azure/azure-rest-api-specs/pull/28438/files#r1802429139