selectedRows is null on initial run of _onListViewStateChanged

Target SharePoint environment

SharePoint Online

What SharePoint development model, framework, SDK or API is this about?

💥 SharePoint Framework

Developer environment

Windows

What browser(s) / client(s) have you tested

• 💥 Internet Explorer
• 💥 Microsoft Edge
• 💥 Google Chrome
• 💥 FireFox
• 💥 Safari
• mobile (iOS/iPadOS)
• mobile (Android)
• not applicable
• other (enter in the "Additional environment details" area below)

Additional environment details

• Edge Version 132.0.2957.140
• SPFx version 1.20.0
• Node.js version 18.17.1
• "New modern", "Post modern", "New new" - or whatever you want to call the new list layout

Describe the bug / error

I'm building a List View Command Set extension

When the page is loaded my, and my _onListViewStateChanged(....) function is run for the first time, the this.context.listView.selefctedRows is undefined, rather than an empty array, this change seemingly happened over night.

Steps to reproduce

Once you create a new List View Command Set extension the _onListViewStateChanged is added automatically, flip the logic as such: compareOneCommand.visible = this.context.listView.selectedRows.length === 0 and you should observe the behaviour

Expected behavior

this.context.listView.selectedRows should be an empty array if no rows are selected, even upon the first run.