diff --git a/src/corelib/text/qunicodetools.cpp b/src/corelib/text/qunicodetools.cpp
index ac6302362da..8f1eb2e5325 100644
--- a/src/corelib/text/qunicodetools.cpp
+++ b/src/corelib/text/qunicodetools.cpp
@@ -604,6 +604,8 @@ static void getLineBreaks(const char16_t *string, qsizetype len, QCharAttributes
 
     QUnicodeTables::LineBreakClass lcls = QUnicodeTables::LineBreak_LF; // to meet LB10
     QUnicodeTables::LineBreakClass cls = lcls;
+    const QUnicodeTables::Properties *lastProp = QUnicodeTables::properties(U'\n');
+
     for (qsizetype i = 0; i != len; ++i) {
         qsizetype pos = i;
         char32_t ucs4 = string[i];
@@ -707,6 +709,14 @@ static void getLineBreaks(const char16_t *string, qsizetype len, QCharAttributes
             goto next;
         }
 
+        if (Q_UNLIKELY(ncls == QUnicodeTables::LineBreak_EM
+                       && lastProp->category == QChar::Other_NotAssigned
+                       && lastProp->graphemeBreakClass
+                               == QUnicodeTables::GraphemeBreak_Extended_Pictographic)) {
+            // LB30b: [\p{Extended_Pictographic}&\p{Cn}] × EM
+            goto next;
+        }
+
         // for South East Asian chars that require a complex analysis, the Unicode
         // standard recommends to treat them as AL. tailoring that do dictionary analysis can override
         if (Q_UNLIKELY(cls >= QUnicodeTables::LineBreak_SA))
@@ -745,6 +755,7 @@ static void getLineBreaks(const char16_t *string, qsizetype len, QCharAttributes
 
     next:
         cls = ncls;
+        lastProp = prop;
     next_no_cls_update:
         lcls = ncls;
     }
diff --git a/tests/auto/corelib/text/qtextboundaryfinder/data/LineBreakTest.txt b/tests/auto/corelib/text/qtextboundaryfinder/data/LineBreakTest.txt
index 1b038cdce9b..32d66183197 100644
--- a/tests/auto/corelib/text/qtextboundaryfinder/data/LineBreakTest.txt
+++ b/tests/auto/corelib/text/qtextboundaryfinder/data/LineBreakTest.txt
@@ -7678,7 +7678,7 @@
 × 1F1F7 × 1F1FA ÷ 1F1F8 × 1F1EA ÷	#  × [0.3] REGIONAL INDICATOR SYMBOL LETTER R (RI) × [30.11] REGIONAL INDICATOR SYMBOL LETTER U (RI) ÷ [30.13] REGIONAL INDICATOR SYMBOL LETTER S (RI) × [30.11] REGIONAL INDICATOR SYMBOL LETTER E (RI) ÷ [0.3]
 × 1F1F7 × 1F1FA × 200B ÷ 1F1F8 × 1F1EA ÷	#  × [0.3] REGIONAL INDICATOR SYMBOL LETTER R (RI) × [30.11] REGIONAL INDICATOR SYMBOL LETTER U (RI) × [7.02] ZERO WIDTH SPACE (ZW) ÷ [8.0] REGIONAL INDICATOR SYMBOL LETTER S (RI) × [30.12] REGIONAL INDICATOR SYMBOL LETTER E (RI) ÷ [0.3]
 × 05D0 × 002D × 05D0 ÷	#  × [0.3] HEBREW LETTER ALEF (HL) × [21.02] HYPHEN-MINUS (HY) × [21.1] HEBREW LETTER ALEF (HL) ÷ [0.3]
-# × 1F02C × 1F3FF ÷	#  × [0.3] <reserved-1F02C> (Other) × [30.22] EMOJI MODIFIER FITZPATRICK TYPE-6 (EM) ÷ [0.3]
+× 1F02C × 1F3FF ÷	#  × [0.3] <reserved-1F02C> (Other) × [30.22] EMOJI MODIFIER FITZPATRICK TYPE-6 (EM) ÷ [0.3]
 × 00A9 ÷ 1F3FF ÷	#  × [0.3] COPYRIGHT SIGN (AL) ÷ [999.0] EMOJI MODIFIER FITZPATRICK TYPE-6 (EM) ÷ [0.3]
 #
 # Lines: 7654