Pasting multiple lines and choosing the option to 'Paste each line into a separate item etc.'
=> if your lines start with the '#' symbol, they will not paste.
(I create a new blank line and paste in that -- the new lines are created as appropriate, but they are blank.)
Reproduced in Sample file with and without WYSIWYG setting.
Thanks Pierre! Apologies for 'bugging' you 
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(my only excuse for that bad pun is that I'm still working @ 10:30 PM...)
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