### Reproduction example https://codesandbox.io/s/heuristic-lake-3rk90q?file=/src/App.js ### Prerequisites 1. Set up any page that listens to `MouseEvent` and log the `pageX` and `pageY` properties of the event (as specified in [the docs](https://developer.mozilla.org/en-US/docs/Web/API/MouseEvent/pageX)) 2. Simulate a `user.pointer` event with additional `pageX` and `pageY` coords passed like `await user.pointer({target: anyTarget, coords: { pageX: 100, pageY: 100 }})` 3. Expect the logs to contain the previously defined values for `pageX` and `pageY`. ### Expected behavior The properties are properly passed to the mouse event and get logged correctly. Works correctly in 14.3. ### Actual behavior The value of these properties is `undefined`. Broken as of 14.4.0. ### User-event version 14.4.3 ### Environment See sandbox ### Additional context When the `assignProps` was changed [in this commit](https://github.com/testing-library/user-event/commit/289828b1b90e79d4ad3bfc227a2e68bd88f13344#diff-15e114f2d858cd2877f0823bd61463f1670197d027e9320b8900534be842712eR194), those two properties were omitted.