InDesign to epub: vector export and file size issues

I am trying to export some books from InDesign (2020) to epub files (fixed layout) for ebook reading. These books are full of simple vector graphics. When I export from InDesign to an epub file it rasterizes all the vector shapes at 300 dpi regardless of how I adjust the conversion settings in the export dialogue. My problem is that Apple iBooks does not allow any images in the file to contain more that 4 million pixels (think area of shape). These books are full of offending files and they all are vectors in my InDesign file. Is there a way to control how vectors are exported? Am I missing something? Or is there a workaround I could implement? I'm at my wit's end and I would appreciate any help!