Type variables in TypedPropertyDescriptor cause compilation errors when using decorator

TypeScript Version: 3.6.3

Search Terms: TypedPropertyDescriptor, MethodDecorator, TS2345, Types of property 'value' are incompatible.

Code

type MyDynamicDescriptor = <T>(input: T) => T
type MyStaticDescriptor = (input: number) => number

function dynamicDecorator(foo: string) {
  return (_: any, __: any, descriptor: TypedPropertyDescriptor<MyDynamicDescriptor>) => {
    console.log('foo:', foo)
    console.log('descriptor.value:', descriptor.value)
  }
}

function staticDecorator(foo: string) {
  return (_: any, __: any, descriptor: TypedPropertyDescriptor<MyStaticDescriptor>) => {
    console.log('foo:', foo)
    console.log('descriptor.value:', descriptor.value)
  }
}

class myClass {
  @dynamicDecorator('bar')
  myMethod(input: number): number {
    return input + 42
  }

  @staticDecorator('bar')
  myOtherMethod(input: number): number {
    return input + 42
  }
}

Expected behavior:
No compilation errors for both dynamicDecorator and staticDecorator.

Actual behavior:
Compilation errors for dynamicDecorator:

error TS2345: Argument of type 'TypedPropertyDescriptor<(input: number) => Promise<number>>' is not assignable to parameter of type 'TypedPropertyDescriptor<MyDynamicDescriptor>'.
  Types of property 'value' are incompatible.
    Type '((input: number) => Promise<number>) | undefined' is not assignable to type 'MyDynamicDescriptor | undefined'.
      Type '(input: number) => Promise<number>' is not assignable to type 'MyDynamicDescriptor'.

Playground Link