I'm unable to replicate that behaviour... Did you include the tab in the copied content?

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]

I pressed Ctrl+a followed by Ctrl+c
There was no tab!
On further investigation, pressing the tab key produces what MS calls an indent. It does not insert the tab character. When I click on the funny little graphic with the lightning flash, I am offered the option to "Change back to tab". That fixes the problem!