CK II - Slavic Union creation resets threat and de jure

[nestorius]

One line summary of your issue
Slavic Union creation resets threat and de jure

Game Version
3.0 latest

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.
I was the Wendish Empire and had dejured most of Europe also had a threat about 98-99% I formed the Slavic Union and it destroyed the wendish empire reset my threat and changed all currently drifting kingdoms to be drifting at the same rate into the Slavic union unfortunatly the kingdoms dejure in the Wendish Empire started at 0 this strikes me as wrong it is at least inconsistent.

Steps to reproduce the issue.
Have a large Empire that has other dejure kingdoms then Slavic Union and form Slavic Union. I have a cloud save so not sure how to add this?

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[nestorius]

Oh one more thing this is a purely cosmetic issue I dont really like the colour of the slavic union preferred the Wendish colour but either way the Slavic colours are traditional red white and blue https://en.wikipedia.org/wiki/Pan-Slavic_colors I realise that this is a bit later but either way none of the component colours are green so I reckon a nice red, white or blue would be better.