An estate can have an income, and be taxed on it. It looks to me as if that is what is happening here.
Once the estate income has been taxed, anything remaining is an asset of the estate. The €8k can be regarded as a partial distribution. It should be returned for CAT, but that amount would attract no liability. When the property is sold, partial distributions and the final distribution will be rolled up together and it is possible that there will be CAT liability.