Unexpected behaviour when adding transitions to a dialog

[sambauers]

I have a Dialog which includes Transitions for a background overlay, and the Dialog Panel as well.

I have found that on the second attempt to open the dialog using an anchor tag as the trigger, the dialog will open, but the page will scroll to the bottom behind the dialog.

I've provided a reduction here - https://replit.com/@sambauers/blur-jump-reduction

Note that the preview screen on Replit may not show the problem well, so best to demo it here - https://blur-jump-reduction.sambauers.repl.co

This reduction emulates the behaviour I'm seeing on my site here - https://rebeccabirch.au (click the email link in the top nav to trigger the dialog)

Any help would be welcome - hopefully it's my implementation, not a bug.