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The VTC reason "This question belongs on another SE site" doesn't work right. Currently, after selecting that option, the only Stack you can choose is WB.meta. I highly doubt that is intended.
Where can I report this bug?
It is not a bug.
It is meant as a moderator only feature, as pointed out here
And also a more thorough reasoning is posted here
You already have; the "bug-report feature" is called Meta.