Yes, this is indeed a bug! Or rather, a regression, as it was working correctly at some point. The player text should really be cleared before options are displayed. I will fix that, but in the meantime, I suggest putting an extra "carol:" line, with nothing after ":" which will clear the player text, but also (annoyingly) require an extra click. But yes, will fix!
I don't know why you @VP does not not see the carol portrait though, that works for me... perhaps if you try deleting the .cache folder? this would cause all intermediate files to be regenerated. it shouldn't be necessary, but maybe there's a glitch happening when changing back and forth with an image with the same name and different extensions, so worth a shot