MutableNamedTuple Type conversion error

General Usage
1

Hello everyone
I want to encapsulate a MutableNamedTuple in my own structure, but I always encounter type conversion errors, please help to see, thank you

using MutableNamedTuples

mutable struct TM{N,T}
  field1::Int32
  field2::String
  
  pm::MutableNamedTuple{N,T}
  function TM{N,T}(;kwargs...) where {N,T}
    a=MutableNamedTuple{N}(values(kwargs.data))  #Here I have successfully generated the MutableNamedTuple of the specified type
    println(dump(a))  
    this =new()
    this.pm=a   #Type conversion error here
    return this
  end
end
TM(;kwargs...) = TM{keys(kwargs.data),typeof(values(kwargs.data))}(;kwargs...) 

function test()
  g = TM(b = 3,)
  #println(dump(g))
  return
end

function ttt()
  @time test()
  #@code_typed test()
end

ttt()