Index: /trunk/src/org/openstreetmap/josm/data/validation/tests/TagChecker.java
===================================================================
--- /trunk/src/org/openstreetmap/josm/data/validation/tests/TagChecker.java	(revision 17765)
+++ /trunk/src/org/openstreetmap/josm/data/validation/tests/TagChecker.java	(revision 17766)
@@ -499,4 +499,5 @@
             || c == 0x0272 || c == 0x019D // "ɲ/Ɲ" (U+0272/U+019D), see #18740
             || c == 0x0273 || c == 0x019E // "ŋ/Ŋ" (U+0273/U+019E), see #18740
+            || c == 0x0142 || c == 0x0294 // see #20754
             || (key.endsWith("ref") && 0x1D2C <= c && c <= 0x1D42); // allow uppercase superscript latin characters in *ref tags
     }
Index: /trunk/test/unit/org/openstreetmap/josm/data/validation/tests/TagCheckerTest.java
===================================================================
--- /trunk/test/unit/org/openstreetmap/josm/data/validation/tests/TagCheckerTest.java	(revision 17765)
+++ /trunk/test/unit/org/openstreetmap/josm/data/validation/tests/TagCheckerTest.java	(revision 17766)
@@ -383,3 +383,11 @@
         assertFalse(TagChecker.containsUnusualUnicodeCharacter("name:kbp", "Kalɩfɔrnii"));
     }
+
+    /**
+     * Non-regression test for <a href="https://josm.openstreetmap.de/ticket/20754">Bug #20754</a>.
+     */
+    @Test
+    void testTicket20754() {
+        assertFalse(TagChecker.containsUnusualUnicodeCharacter("name", "Yuułuʔiłʔatḥ Lands"));
+    }
 }