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For me it is showing yellow with black (not white) text which seems OK.
Dark theme is always light text on dark background, not the other way around.
Also, the color itself feels out of place... how does it relate to the other colors? What other UI element uses yellow? It has to make sense in the entire color scheme.
Finally, consider the following test: In a dark room, only monitor with pharo and dark theme is producing light. Now a large popup with yellow background appears... did your eyes squint? can you suddenly see the other side of the room? :)
Peter