Custom date format shows current date/time instead of modification/access date in some conditions

As title says, in the detailed view, using certain strings for a custom date format, current time & date is displayed instead of modification date/access date in their respective columns.

The conditions are: use one of the following anywhere in the custom string: % %C %D %e %F %g %G %h %k %l %p %r %R %s %t %T %u %V %z, and everything after it becomes current values instead of mod/access values. Other (single-character) options work as expected.

To easily reproduce, use %S %h %S and locate any file that hasn't been modified today. Using %S %b %S gives the correct value, using %S %h %S gives the correct (constant) second in the first place, but current month and second (changing every second) in second and third.

Using Thunar 1.8.14, xfce 4.14