Canon Printer – Examining the Nozzle Check Pattern

To troubleshoot printing issue on my Canon Pixma MG2900 printer, I’m using this official doc from Canon. The test page of my nozzle check prints almost identical to the test page shown in the above article (see screenshot below) except that the magenta color
(item (B) in the image) on my test page is blank (not showing pink color).

Question: What could be a cause of the printing issue if the test page of a nozzle check shows the stripes (B) in the image are blank (not showing magenta color). And how the issue can be fixed?

Printer Nozzle Check Pattern check

Following is the screenshot of the final dialog box of my nozzle check wizard. [my test page printout is almost the same as the left section of this image except that the magenta color section is blank (white):
output of printer nozzle check wizard