InplaceEditIT.saveFromSourceMode is flickering

expected: <{{success}}
test
{{/success}}> but was: <<!--startmacro:success|-|--><div data-xwiki-non-generated-content="java.util.List&lt;org.xwiki.rendering.block.Block&gt;" class="xwiki-metadata-container"><p>test</p></div><!--stopmacro-->>

org.opentest4j.AssertionFailedError: 
expected: <{{success}}
test
{{/success}}> but was: <<!--startmacro:success|-|--><div data-xwiki-non-generated-content="java.util.List&lt;org.xwiki.rendering.block.Block&gt;" class="xwiki-metadata-container"><p>test</p></div><!--stopmacro-->>
	at org.xwiki.edit.test.ui.InplaceEditIT.saveFromSourceMode(InplaceEditIT.java:199)
	at java.base/java.lang.reflect.Method.invoke(Method.java:568)
	at java.base/java.util.ArrayList.forEach(ArrayList.java:1511)
	at java.base/java.util.ArrayList.forEach(ArrayList.java:1511)
	at java.base/java.util.ArrayList.forEach(ArrayList.java:1511)