Multirename by modified date give a date in wrong format out. A doublepoint : cant be in a filename. Filenames will be sorted by text, therefore have a date in a filename to be in wrong order with the year at front and the second at last (Example: "|Y]-|M]-|D] |h]-|m]-|s]"
The Core-Date works not and the main date "|Y]-|M]-|D] |h]-|m]-|s]" is using a wrong date which is not useable. It seem its the creation date. The creation date is often not useable because its changed after copy from a mobile device. Renaming by exif have i not tested yet, but i can say, the exif date have also to be in a wrong order like |Y]-|M]-|D] |h]-|m]-|s].
Best regards and keep he good work and make the best commander of all.