Screen readers not ignoring decorative images in Rise 360

Hello! I'm working on a Rise course with some images that are decorative and need to be ignored by the screen reader.

However, when you arrow through the course with a screen reader in the published output, any images with a blank tag or marked as "" in the alt text options will either have the file name read or the following: "To get missing image descriptions, open the context menu."

Many resources I've read say that the screen reader should be skipping the image, so I'm not sure why it's still being acknowledged in this way. Any help is appreciated.

Thank you in advance!