CK II - Unable to start prepared invasion

[roaring_salmon]

One line summary of your issue
Unable to start prepared invasion

Game Version
2.8.3.4

What expansions do you have installed?

Horse Lords,
Sons of Abraham,
The Old Gods,
The Republic,
Legacy of Rome,
Sword of Islam

Do you have mods enabled?
No

Please explain your issue is in as much detail as possible.
I started preparation of invasion, but I was unable to declare war until the target country lost few counties (I simply didn't have corresponding CB). Seems like that country became too big to be the target of invasion.

Steps to reproduce the issue.
Prepare invasion of relatively big country (e.g. East Francia).

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[Lewa263]

As the Wiki states, "The target realm must have between 9 and 50 holdings within the target de jure kingdom." I believe there's something about that in the tooltip, though I don't remember exactly what it says. This isn't a bug.

 

[jruderman]

Did your target gain holdings between you selecting "Prepare Invasion" and tying to select "Declare War"?

 

[roaring_salmon]

Did your target gain holdings between you selecting "Prepare Invasion" and tying to select "Declare War"?

I suppose, yes. Unfortunately I played in ironman mode, so I unable to check it.