No HTML mouse input in Preview in Editor

We have a little debug panel that is created using HTML elements appended to the GameDiv directly. This all works fine in browser, but in Preview in Editor there are no mouse events going to any code (verified by using Event Listener Breakpoints). The game of course gets mouse input, but it doesn’t appear to be going through the normal channels.

Is there a possible workaround we could use for this issue, or is there a potential fix on the horizon? It’s tough not having all our tools work in all the ways people want to test the game.

Could you provide a simple demo for verification?