diff -Nru picard-2.6.3/debian/changelog picard-2.6.3/debian/changelog
--- picard-2.6.3/debian/changelog	2021-07-25 14:46:55.000000000 +0000
+++ picard-2.6.3/debian/changelog	2021-07-26 14:05:23.000000000 +0000
@@ -1,8 +1,8 @@
-picard (2.6.3-1+git4117~ppa25~ubuntu20.10.1) groovy; urgency=low
+picard (2.6.3-1+git4118~ppa25~ubuntu20.10.1) groovy; urgency=low
 
   * Auto build.
 
- -- Launchpad Package Builder <noreply@launchpad.net>  Sun, 25 Jul 2021 14:46:55 +0000
+ -- Launchpad Package Builder <noreply@launchpad.net>  Mon, 26 Jul 2021 14:05:23 +0000
 
 picard (2.0.4-0) disco; urgency=low
 
diff -Nru picard-2.6.3/debian/git-build-recipe.manifest picard-2.6.3/debian/git-build-recipe.manifest
--- picard-2.6.3/debian/git-build-recipe.manifest	2021-07-25 14:46:55.000000000 +0000
+++ picard-2.6.3/debian/git-build-recipe.manifest	2021-07-26 14:05:23.000000000 +0000
@@ -1,3 +1,3 @@
-# git-build-recipe format 0.4 deb-version 2.6.3-1+git4117~ppa25
-lp:picard git-commit:610f85b304cdffa21da94fa0ff754fe128e170a7
+# git-build-recipe format 0.4 deb-version 2.6.3-1+git4118~ppa25
+lp:picard git-commit:866fb7866061559b1f7df0b1588a55a5240ae9f7
 nest-part packaging lp:~musicbrainz-developers/picard/+git/picard-debian-packaging debian debian git-commit:9ce60ecf3b18c931549ef6fbf398dfc7ad13ed54
diff -Nru picard-2.6.3/test/test_script.py picard-2.6.3/test/test_script.py
--- picard-2.6.3/test/test_script.py	2021-07-25 14:46:36.000000000 +0000
+++ picard-2.6.3/test/test_script.py	2021-07-26 14:05:04.000000000 +0000
@@ -1760,3 +1760,22 @@
             self.parser.eval("$dateformat()")
         with self.assertRaisesRegex(ScriptError, areg):
             self.parser.eval("$dateformat(2021-07-21,,,)")
+
+    def test_cmd_is_multi(self):
+        context = Metadata()
+        context["foo"] = "a; b; c"
+        context["bar"] = ""
+
+        self.assertScriptResultEquals("$is_multi(%foo%)", "", context)
+        self.assertScriptResultEquals("$is_multi(%bar%)", "", context)
+        self.assertScriptResultEquals("$setmulti(baz,a)$is_multi(%baz%)", "", context)
+        self.assertScriptResultEquals("$setmulti(baz,a; b; c)$is_multi(%baz%)", "1", context)
+        self.assertScriptResultEquals("$is_multi(a; b; c)", "1", context)
+        self.assertScriptResultEquals("$is_multi(a)", "", context)
+
+        # Tests with invalid number of arguments
+        areg = r"^\d+:\d+:\$is_multi: Wrong number of arguments for \$is_multi: Expected exactly 1, "
+        with self.assertRaisesRegex(ScriptError, areg):
+            self.parser.eval("$is_multi()")
+        with self.assertRaisesRegex(ScriptError, areg):
+            self.parser.eval("$is_multi(a,)")