Reproduced on Windows XP (32-bit), lp:inkscape/0.92.x rev. 15318.
You don't need to group with other objects. The same issue can be reproduced if you just group the object alone (for faster reproduction).
As for bug #1656093, the console shows the following message when copying the group:
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WARNING **: Unknown LPE type specified, LPE stack effectively disabled
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Reproduced on Windows XP (32-bit), lp:inkscape/0.92.x rev. 15318.
You don't need to group with other objects. The same issue can be reproduced if you just group the object alone (for faster reproduction).
As for bug #1656093, the console shows the following message when copying the group:
----
WARNING **: Unknown LPE type specified, LPE stack effectively disabled
----