RealtimeWYSIWYGEditorIT#editDifferentParagraphs is flickering

expected: <Start. The five boxing wizards jump quickly. The quick brown fox jumps over the lazy dog. First
The quick brown fox jumps over the lazy dog. The five boxing wizards jump quickly. Second> but was: <Start. boxing wizards jump quickly. The quick brown fox jumps over the lazy dog. First
The quick brown fox jumps over the lazy dog. The five boxing wizards jump quickly. Second>

org.opentest4j.AssertionFailedError: 
expected: <Start. The five boxing wizards jump quickly. The quick brown fox jumps over the lazy dog. First
The quick brown fox jumps over the lazy dog. The five boxing wizards jump quickly. Second> but was: <Start. boxing wizards jump quickly. The quick brown fox jumps over the lazy dog. First
The quick brown fox jumps over the lazy dog. The five boxing wizards jump quickly. Second>
	at org.xwiki.realtime.wysiwyg.test.ui.RealtimeWYSIWYGEditorIT.editDifferentParagraphs(RealtimeWYSIWYGEditorIT.java:418)
	at java.base/java.lang.reflect.Method.invoke(Method.java:566)
	at java.base/java.util.ArrayList.forEach(ArrayList.java:1540)
	at java.base/java.util.ArrayList.forEach(ArrayList.java:1540)
	at java.base/java.util.ArrayList.forEach(ArrayList.java:1540)