The Save Image filename_prefix tokens is broken

[hortom]

Hi, thanks for this amazing tool! With the latest update, it looks like that the prefix is broken. Previously, %date:yyyy-MM-dd-hh-mm-ss% worked but now, it tries to save the files as %date and it is just an empty file. Could you please fix it, or if the format has been changed then point me to the doc? Many thanks!