I messed around with your file on my PB Colour (not Inkpad), and I did manage to get it to hang once while I was zooming in and out. The device did not crash, though.
I could also view it with the pbimageviewer app that I maintain. It shows colours, but not as nicely as the native app. If you are desperate, you could use it instead of the native app to view CBR/CBZ files.
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