I noticed that after I upgraded to the latest version of Pro the Creative CTA stopped working properly. When I hover over the CTA and it flips to secondary state nothing is visible (no text, icon etc.).
On another install of Pro also updated to the latest version, I checked by adding a brand new Creative CTA to that page, and had the same issue, when the CTA flips nothing shows on page.
First part of the CTA is there, but on hover it flips away and nothing flips in to replace it, just empty space. If I click on the empty space the link works, but nothing is visible, all I see is the background color.