Chart Colours: Bug or expected behaviour

[Toki]

All:

Before I file a bug-report, I want to know if this is due to my having a 
strange setup, or is the expected behaviour, or is a bug other people 
experience.

Image is at https://i.imgur.com/fJZuiF4.png

Version: 7.5.0.2 (X86_64) / LibreOffice Community
Build ID: c0dd1bc3f1a385d110b88e26ece634da94921f58
CPU threads: 4; OS: Linux 5.10; UI render: default; VCL: gtk3
Locale: en-ZA (en_NZ.UTF-8); UI: en-ZA
Calc: threaded

Look at the default colours at >Tools >Options >Charts >Default Colors.

Look at the colours in the bar chart.
(The bar chart has the colours this specific chart requires.)

I tried umpteen times to change the default colours for charts to the 
colours I use --- the colours in the bar chart.

Is >Tools >Options >Charts >Default Colors no longer functional?

jonathon