+ When `checkElement` (or `saveElement`) was called with a `ChainablePromiseElement`, the lazy promise-based element reference that WebdriverIO's `$()` returns, the element was passed directly as an argument to `browser.execute()` without being awaited first. `browser.execute()` serializes its arguments for transfer to the browser context and cannot handle a pending Promise, so it arrived in the browser as a plain empty object `{}` instead of a WebElement reference. This caused `element.getBoundingClientRect is not a function` because the browser-side `scrollElementIntoView` script received `{}` rather than a DOM element.
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