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Markers on legend missing in 21.2 vs 19.2

Hi Folks,

I upgraded from 19.2 to 21.2 version of Ultimate for WPF. All good but suddenly I'm missing markers on my legends (see below) when I revert references back to 19.2 all seems to work again. 

What could be the issue? I only changed references in the project. Should I do something more to upgrade to the new version?