@@ -, +, @@ 
    Preventing self-blockers, if a package is moved and the package maintainer decided to block the old package name. (see #367215)
--- a/pym/portage/tests/update/test_update_dbentry.py	
+++ a/pym/portage/tests/update/test_update_dbentry.py	
@@ -24,6 +24,18 @@ class UpdateDbentryTestCase(TestCase):
 			(("move", Atom("dev-libs/A"), Atom("dev-libs/B")), "1",
 				"  >=dev-libs/A-1:0  ", "  >=dev-libs/B-1:0  "),
 
+			(("move", Atom("dev-libs/A"), Atom("dev-libs/B")), "1",
+				"  !dev-libs/A  ", "  !dev-libs/A  "),
+
+			(("move", Atom("dev-libs/A"), Atom("dev-libs/B")), "1",
+				"  !dev-libs/A:0  ", "  !dev-libs/B:0  "),
+
+			(("move", Atom("dev-libs/A"), Atom("dev-libs/B")), "1",
+				"  !>=dev-libs/A-1:0  ", "  !>=dev-libs/B-1:0  "),
+
+			(("move", Atom("dev-libs/A"), Atom("dev-libs/B")), "1",
+				"  !>=dev-libs/A-1  ", "  !>=dev-libs/B-1  "),
+
 			(("move", Atom("dev-libs/A"), Atom("dev-libs/B")), "2",
 				"  dev-libs/A[foo]  ", "  dev-libs/B[foo]  "),
 
--- a/pym/portage/update.py	
+++ a/pym/portage/update.py	
@@ -53,6 +53,9 @@ def update_dbentry(update_cmd, mycontent, eapi=None):
 					continue
 				if atom.cp != old_value:
 					continue
+				# prevent self-blockers
+				if atom.blocker and atom.slot is None and atom.operator is None and atom.version is None:
+					continue
 
 				split_content[i] = token.replace(old_value, new_value, 1)
 				modified = True