CK II - Children can be given their siblings as Concubines

[Zoomun]

One line summary of your issue
Children can be given their siblings as Concubines

Game Version
3.1

What expansions do you have installed?
All of the above

Do you have mods enabled?
No

Please explain your issue is in as much detail as possible.
Whenever I want to give my children concubines or consorts I get the option to give them their siblings. This is fine if I picked divine marriage but I didn't. This bug has been around since at least the release of Holy Fury

Steps to reproduce the issue.
Offer a concubine to your kid

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[Hopit]

Here I was hoping no one would notice this

 

[Zoomun]

Here I was hoping no one would notice this

I'm not saying I didn't use it I just figured I wasn't supposed to.

 

[Ceebie]

hellooo. thanks for the report. we're aware of the issue, and its logged internally.