Chrome Version: 58.0.3005.2 (Official Build) canary (64-bit)
OS: Windows 10

What steps will reproduce the problem?
(1) Cloud print a page
(2) Wait for print dialog to appear
(3)

What is the expected result?

Print dialog appears in current browser

What happens instead?

Another browser session is launched, using Chrome Stable, instead of within my currently running Chrome Canary. Chrome Stable is not even running.

Please use labels and text to provide additional information.

This worked before, but I don't know when before.