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Build Number (this can be found in the top right hand corner of the menu screen) -12678.0
Detailed description of your issue -Chaos Rifts do not generate Chaos Corruption. As seen in the following screenshots, they have no campaign effects. These were created by me, the player, as Chaos Warriors. The lack of corruption is further evidenced by the extremely low corruption in Northern Oblast, a province I razed a long time ago, yet has almost no corruption despite having 2 Chaos Rifts.
Reproduction steps -As Chaos Warriors, raze a city. Check campaign effects and corruption levels of province.
.save if your issue is on the Campaign Map OR -Attached