Option for transparent links and areas removed a few days ago

I have created all my dashboards with transparent links as navigation areas. A few days ago all these links are suddenly coloured and I can't make them transparent again. I could also only create buttons with colour, which really bothers me because it ruins all my dashboards.

I have tested the option to link an empty png as a transparent image, but the dashboard reloads the page when clicking on the link and is therefore not comparable to the seamless linking with buttons or text links and is therefore not an option for me.

Has something been changed by Looker? What is the best way to make invisible navigations now?

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