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+<!DOCTYPE html>
+<title>
+  Multi-line column flex fragmentation: early break inside columns w/ vertical
+  writing-mode.
+</title>
+<link rel="help" href="https://drafts.csswg.org/css-flexbox-1/#pagination">
+<link rel="match" href="../../reference/ref-filled-green-100px-square.xht">
+<style>
+  .multicol {
+    column-count: 2;
+    column-fill: auto;
+    column-gap: 0px;
+    block-size: 100px;
+    inline-size: 100px;
+    position: relative;
+    background: red;
+  }
+  .abs {
+    position: absolute;
+    inline-size: 50px;
+    background: white;
+  }
+  #flex {
+    display: flex;
+    flex-direction: column;
+    flex-wrap: wrap;
+    block-size: 200px;
+  }
+  #flex > div {
+    background: green;
+    inline-size: 25px;
+  }
+</style>
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+<div style="writing-mode: vertical-lr;">
+  <div class="multicol">
+    <div class="abs" style="top: 100px; block-size: 50px;"></div>
+    <div id="flex">
+      <div>
+        <div style="block-size: 50px; inline-size: 25px;"></div>
+        <div style="block-size: 50px; inline-size: 25px;"></div>
+      </div>
+      <div style="block-size: 100px; break-before: avoid;"></div>
+      <div>
+        <div style="block-size: 50px; inline-size: 25px;"></div>
+        <div style="block-size: 50px; inline-size: 25px; break-after: avoid;"></div>
+      </div>
+      <div style="block-size: 100px;"></div>
+    </div>
+  </div>
+</div>