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I did some further tests
Test 2. I tested the Impress Chart which I submitted to bug 56766. I open it in normal mode (not Read Only) from my HDD. There I observed an equivalent behavior but Gradient behaved like Color in the file of Rainer Bielefeld.
Therefore I made test 3. I created a new Column Chart in Impress and observed the same behavior as in Rainer Bielefelds' slide which I opened only in Read Only mode.
An additional observation was made in all charts used for testing:
When switching from Area Fill Color, to Area Fill Hatching the last selected color was displayed as background color and does not match the background color of the hatching patterns.