Using prost and prost-wkt:;MessageSerde

[Helen300]

Hello! I am trying to use MessageSerde in defining a trait such as

pub trait Report {
      type Heading: MessageSerde
}

When I attempt to implement trait Example

impl Report for NewsReport {
     type Heading: NewsReportHeading  # where NewsReportHeading is a Protobuf message
}

I see that my generated protobuf contains which seems to be all I need for MessageSerde trait which is prost::Message + std::any::Any

#[derive(::serde::Serialize, ::serde::Deserialize)]
#[derive(Clone, PartialEq, ::prost::Message)]

But I get the following Rust Error

error[E0277]: the trait bound NewsReportHeading: MessageSerde` is not satisfied
  
34 |     type Heading = NewsReportHeading;
   |                    ^^^ the trait `MessageSerde` is not implemented for `NewsReportHeading`
   = help: the following other types implement trait `MessageSerde`:
             prost_wkt_types::Duration
             Timestamp
             Struct
             Value
             prost_wkt_types::ListValue
             prost_wkt_types::Any
             prost_wkt_types::Empty
             FieldMask
note: required by a bound in `Report::Heading`
31 |     type Heading: MessageSerde + Clone;
   |                   ^^^^^^^^^^^^ required by this bound in `Report::Heading`

I only get this error if I use a version of prost greater than 11.9 but I'd like to stay up to date with the version of prost. In addition, if I use any version of prost < 11.9, I get a different error message regarding the usage of prost::Message

the trait bound `<protobuf message name>: prost::Message` is not satisfied
the following other types implement trait `prost::Message`:
  bool
  i32
  i64
  u32
  u64
  f32
  f64
  Box<M>

I tried to look through the release of prost https://github.com/tokio-rs/prost/releases/tag/v0.12.0 but couldn't quite find what might've caused this change. Would appreciate any help and insight to help me understand prost::Message and prost-wkt:MessageSerde!