sl-select throws exception if a sl-input in the same form receives a new value with autofill in MS Edge

Describe the bug

A console error message appears in some cases when a sl-input receives an autofill value.

To Reproduce

Create a form with at least one sl-input and sl-select element.
Upload the HTML document on a web server. Autofill doesn't work on local files.
Open the page in Microsoft Edge, fill it and submit it. After submission, Edge will remember the values you entered.
Refresh the page, fill the form again, but now use the autofill to enter the same value in the sl-input as earlier.
You will get a console error:

TypeError: Cannot read properties of undefined (reading 'length')
    at SlSelect.handleDocumentKeyDown (chunk.IMHWGJEP.js:178:21)
    at SlSelect.handleComboboxKeyDown (chunk.IMHWGJEP.js:282:10)
    at EventPart.handleEvent (lit-html.ts:2068:29)

It appears that the autofill triggers sl-keydown, but Edge sends undefined instead of a valid keydown event.

It also appears to randomly occur or not occur, depending on the web server. The demo page I published on GitHub Pages doesn't trigger it. If I host the same HTML document on our intranet server, running IIS, then it's triggered. I believe this is due to how Autofill works.

Demo

https://tomcatmwi.github.io/sl-select-bug-demo

Screenshots

https://ibb.co/fC0NR62 sl-bug

Browser / OS

OS: Windows
Browser: Microsoft Edge for Businesses
Browser version: Version 126.0.2592.102 (Official build) (64-bit)

Additional information

Here is a simple reproduction:

<html>
<meta charset="utf8" />
<head>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/@shoelace-style/shoelace@2.15.1/cdn/themes/light.css" />
<script type="module" src="https://cdn.jsdelivr.net/npm/@shoelace-style/shoelace@2.15.1/cdn/shoelace-autoloader.js"></script>

</head>
<body>

<form name="someform" submit="e => { e.preventDefault(); }">

<div>
  <sl-input name="somevalue" label="Some value:" />
</div>

<div>
<sl-select name="trouble" value="1" label="I will cause trouble!" />
  <sl-option value="1">Option 1</sl-option>
  <sl-option value="2">Option 2</sl-option>
  <sl-option value="3">Option 3</sl-option>
</sl-select>
</div>

<div>
  <sl-button type="submit">Submit</sl-button>
  <sl-button type="reset">Reset</sl-button>
</div>

</form>

</body>
</html>

shoelace-style / shoelace