I think I may have reported this a long time ago, but it's happened again: gaining a CB against the next country in the alphabet rather than the one you should gain the CB against - it only happens with force-annexations. In the latest example, I am Austria and Poland force annexes my vassal, Modena. The diplomatic screen informs me I now have a temporary CB against Prussia and warns me that if I declare war on Poland I will take stab hits for having no CB.
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