diff --git a/src/Text2.cpp b/src/Text2.cpp
index b990703db8..5ae4e43594 100644
--- a/src/Text2.cpp
+++ b/src/Text2.cpp
@@ -1186,7 +1186,11 @@ bool Text::deleteEmptyParagraphMechanism(Cursor & cur,
 			   max(old.pit() - 1, pit_type(0)),
 			   min(old.pit() + 1, old.lastpit()));
 		ParagraphList & plist = old.text()->paragraphs();
+		bool const soa = oldpar.params().startOfAppendix();
 		plist.erase(boost::next(plist.begin(), old.pit()));
+		// do not lose start of appendix marker (bug 4212)
+		if (soa)
+			plist[old.pit()].params().startOfAppendix(true);
 
 		// see #warning above
 		if (cur.depth() >= old.depth()) {
diff --git a/src/paragraph_funcs.cpp b/src/paragraph_funcs.cpp
index bc2d3257a0..242db98932 100644
--- a/src/paragraph_funcs.cpp
+++ b/src/paragraph_funcs.cpp
@@ -134,7 +134,10 @@ void breakParagraph(BufferParams const & bparams,
 	}
 
 	if (!isempty) {
+		bool const soa = par.params().startOfAppendix();
 		par.params().clear();
+		// do not lose start of appendix marker (bug 4212)
+		par.params().startOfAppendix(soa);
 		par.layout(bparams.getTextClass().defaultLayout());
 	}
 
diff --git a/status.15x b/status.15x
index 7afde361d8..5ebe93f566 100644
--- a/status.15x
+++ b/status.15x
@@ -121,6 +121,9 @@ What's new
 
 - Fix deletion of pars with leading spaces (bug 3600).
 
+- Fix loss of start-of-appendix information when creating/deleting an
+  empty paragraph (bug 4212).
+
 - Fix that Revert and Save As were treated as "file is externally modified"
   (bug 4193)