I settled for a temporary solution, where I just launch my e-mail address on select from the icon, so that people can "like" an item this way. Then the icon is perfectly visible. Color and transparency are set properly, 1 and 0 respectively in RGBA.
Actually, today, the workaround I attempted yesterday is not working at all anymore.
Yesterday, I inserted the icon directly into a gallery with the connected table that is to be patched, because the function was not recognizing the table vectors, if I just inserted the icon into the screen. The function recognized the vectors, and everything seemed fine, but the icon was not visible in the mobile app or the desktop preview.
However, I tried this again today, to produce the screenshots, but the function is not recognizing the vectors in the gallery with the connected table at all.
As you can see, I am working in Norwegian. I also seem to have to use semicolons instead of commas. I am thinking that there might be some issues with encoding as well ?
I attach two screenshots, one with the temprary solution and the icon perfectly visible with the "Launch" on select, and one with my failed attempt to patch "Tbl_Ønsker".