Fix breakpoints

CHANGELOG.md

@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
+## [Unreleased]
+
+### Fixed
+
+- Fixed `VERTICAL_BREAKPOINTS` doesn't work https://github.com/Textualize/textual/pull/5785
+
 ## [3.2.0] - 2025-05-02
 
 ### Fixed

src/textual/screen.py

@@ -1375,7 +1375,7 @@ async def _on_resize(self, event: events.Resize) -> None:
         if horizontal_breakpoints:
             self._set_breakpoints(width, horizontal_breakpoints)
         if vertical_breakpoints:
-            self._set_breakpoints(height, horizontal_breakpoints)
+            self._set_breakpoints(height, vertical_breakpoints)
 
     def _set_breakpoints(
         self, dimension: int, breakpoints: list[tuple[int, str]]