Issue with WisejThemeBuilder base64 encoder and image picker (animated GIF)

Hi!
I have issues selecting a gif image with WisejThemeBuilder image picker.
When i select a gif for ajax preloader (file or url) the image string representation changes to static base64 image string (data:image/png…) (animation doesn’t works)
I think, the correct should be: data:image/gif;base64…

As workaround i converted gif to base 64 gif image animation with free online site:
https://www.base64-image.de/
and copy result (encoded base64) to base64 wisej field and animation and preview works.

Thanks in advance!