java generation throws no-corresponding-method-param, previously worked

[glharper]

Running "tsp-client update" against these TypeSpec routes I'm seeing this error:

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.

As of six months ago, auto gen worked from that spec. What am I doing wrong?

[glharper]

For anyone else with this issue, see here