I've been asked by the Nextcloud team to report that problem here because they're using the vue2-datepicker function in their Contacts app software which causes the described problem: Nextcloud Issue:.
The displayed year range in the date select dialog should reflect the available options.
The displayed year range in the date select dialog is always one year ahead of the available options.

Yes, It should be 1940 ~ 1949
v2.9.2 fixed it.
Most helpful comment
Yes, It should be 1940 ~ 1949