ICU-22707 Failing tests with lb=CM-as-AL & ea=W

icu4c/source/test/testdata/rbbitst.txt

@@ -2221,4 +2221,15 @@ Bangkok)•</data>
 <data>•毕•士•悌•（1901•年•—•1936•年）•又•名•“杨•林”，•朝•鲜•籍•红•军•将•领•</data>
 <data>•Anmerkung: •„White“ •bzw. •‚白•人‘ •– •in •der •Amtlichen •Statistik•</data>
 <data>•« Complex »« chaining » •</data>
-<data>•« .618 »•</data>  # Interaction with the ICU tailoring to break before such numbers.
+<data>•« .618 »•</data>  # Interaction with the ICU tailoring to break before such numbers.
+
+# Non-breaking lb=SP (from LB14 and LB15a) followed by a lb=CM-as-AL that is
+# ea=W, in a position that would match initial context for LB19a if it were not
+# ea=W.
+# See https://github.com/unicode-org/icu/pull/3028#issuecomment-2200259320.
+<data>•︷ \U00016FF1•⸠ᅛᆅ•</data>
+<data>•︷ « \U00016FF1•⸠ᅛᆅ•</data>
+<data>•A »« \U00016FF1•⸠ᅛᆅ•</data>
+<data>•︷ \U00016FF1\u302B•⸠ᅛᆅ•</data>
+<data>•︷ « \U00016FF1\u302B•⸠ᅛᆅ•</data>
+<data>•A »« \U00016FF1\u302B•⸠ᅛᆅ•</data>