I understand, here’s what I suggest, as mentioned above:
Copy the text that is not showing up correctly from the original CSS file
Paste it into the Styles window and replace what is wrong.
See if that works or not or if it is not going to allow you to do it let us know that too.
If that works, then you have a work around for now, if not let us know and hopefully someone will have more options for you to try since I don’t work with those image types as of yet.
Also I would suggest you post this in the Bugs forum as this post seems to be in no particular topic right now. Use a link to this thread in your post in Bugs forum so you don’t have to retype it all. The Devs will see it better there than in other areas and will usually tell us if something isn’t supported yet, or tell us that it will be fixed soon etc. They are pretty good about getting bugs fixed within a reasonable amount of time. Sorry you’re having these issues, but let them know, “If they don’t know it’s broke, they can’t fix it” is my motto for most things.