Size column shows 4KiB for all folders

Thunar 4.18.7 (I apologize if this has already been addressed in newer versions already)

When you look in the “Size” columns for all Folders for some reason it always says 4KiB, not sure if this is on purpose but if not maybe could consider updating this.
I also noticed that for some reason the “Downloads” folder is the only folder that shows a different size value than the others, it shows 16KiB.
I do not use it personally but the only file manager I have seen show 4KB and 16KB for Downloads is a file manager called Midnight Commander, so unless Thunar is based on this in some way, if not these values must be coming from somewhere?

I have seen different file managers use different approaches for this...
Leave it blank
[DIR]
DIR (this option shown should have <> on each side similar to the [DIR] option above but comes up blank on this sites formatting)

I think all of these are good options because they are all simple clean looking approaches.
Again unless there is a reason for the 4KiB I am unaware of.

Thank You