"First released" actually sorts by production year

Sorting movies in a list by "First released" does not sort them by release date. It actually sorts by production year!

See my little test list:

Once Upon a Time There Was a Singing Blackbird (production year 1970, release date 10 October 1975)

is listed before

Dracula A.D. 1972 (production year 1972, release date 17 November 1972).

The main reason for this is that some titles have missing release dates but generally always have the year release date, hopefully this can be fixed in the future.