This test, uses this sample image and tiles it onto two canvases using drawImage. See the actions log at the bottom of the page for exact info on what canvas commands are performed. If I reload this page enough times (usually just once, sometimes several more) on Mac OS X 10.14.6 running Chrome 77.0.3865.90 or Canary 79.0.3928.3, then I see the 2nd canvas ending up blank.
Actions log:
