Custom date formats not available in pages
I used to be able to set custom date formats like DD.MM.YYYY in "System Preferences > Language & Region > Advanced > Dates" and then have them readily available when double clicking the Insert > Date & Time object in Pages. As of now the "Choose Date Format" drop-down yields only the standard formats, rendering this function useless for foreign language documents.
Am I overlooking a (new) setting hidden somewhere within Pages or has its functionality just degraded as it was updated?
I am on version 6.3.1 (5249). In previous versions this was not an issue.
In Microsoft Word for Mac the date formatting works like a charm, offering an abundance of formats to choose from.
iMac, macOS Sierra (10.12.6)