Properties detectable as excess due to missing discriminant should be flagged in JSX expressions

Bug Report

When using TSX syntax to create a element which props are typed as a discriminated union, validation works when given element is constructed in TSX syntax without children, but loses validation once you add children.

🔎 Search Terms

react createElement validation tsx jsx children throws

🕗 Version & Regression Information

• This is the behavior in every version I tried (3.x - 4.3.0-beta)

⏯ Playground Link

Playground link with relevant code

💻 Code

// this one should error but does not because it has children (tsx syntax)
const B = (
  <Accordion defaultSelectedKeys={new Set()}>
    <span>1</span>
  </Accordion>
)
// while using createElement it does error (like it should)
React.createElement(Accordion, {defaultSelectedKeys:new Set<Key>()}, <span>1</span>)
// while these also error (like they should) because they are without children.
const X = <Accordion defaultSelectedKeys={new Set()} />
const Y = <Accordion multiple defaultSelectedKey="1" />

🙁 Actual behavior

Like shown above, while React.createElement throws like it should, using TSX syntax though, it stops working.

🙂 Expected behavior

Same behavior as with createElement - raise a validation error with children

Start with the linked TypeScript Playground and compare the TSX examples with the React.createElement call, focusing on discriminated-union props when children are present. Trace the compiler's JSX prop validation and add a regression test for the shown Accordion case; done means TSX reports the same validation error as createElement.