Image occlusion's "Fill with colour" option not working

> In the past, I relied on duplicating empty text zones to shape them to my will to hide information on a card : that way I could hide any information that was not relevant to me yet would give me a clue on the hidden answer.
> I have noticed a new button on the Image Occlusion editor thinking it would allow me to choose a fill color for the masks but it doesn’t seem to do anything so far.
> image3200×2213 984 KB
> Thank you for reading!!

Originally reported on https://forums.ankiweb.net/t/allow-to-edit-mask-colors-in-io-editor/67159

I suspect iOS doesn't open the color selector when the input click is triggered programmatically.