The clock in the top left corner has the same font as the rest of the system, but doesn’t match the symbols in the top right corner. This has been the case since Nothing OS 4.0. The symbols are, I think, the standard Android icons. In the dropdown menu, the clock’s font is bold. This already looks better.
During the last update, I briefly saw, before the update was complete, the ‘correct’ clock, meaning with the font and weight that match the top right corner. Right now, for example, the 4 in 4G at the top right is different from the one in the clock.
They could use the Android font (I think) or use custom icons. Hopefully this will change with the next update.
Have you also noticed this and does it bother you?