offset_position="data" has been deprecated in Matplotlib.

README.rst

@@ -548,9 +548,6 @@ Possible optimizations
 - Path simplification (although cairo appears to use vertex reduction and
   Douglas-Peucker internally?).
 - Use QtOpenGLWidget and the cairo-gl backend.
-- ``hexbin`` currently falls back on the slow implementation due to its use of
-  the ``offset_position`` parameter.  This should be fixed on Matplotlib's
-  side.
 
 What about the already existing cairo (gtk3/qt4/qt5/wx/tk/...cairo) backends?
 =============================================================================

src/_mplcairo.cpp

@@ -1176,10 +1176,7 @@ void GraphicsContextRenderer::draw_path_collection(
   //   positions would be different on every stamp.  (NOTE: Actually it may be
   //   possible to use the hatch as the source and mask it with the pattern.)
   // - FIXME[matplotlib]: offset_position is set to "data".  This feature
-  //   is only used by hexbin(), so it should really just be deprecated;
-  //   hexbin() should provide its own Container class which correctly adjusts
-  //   the transforms at draw time (or just be drawn as a quadmesh, see
-  //   draw_quad_mesh).
+  //   is only used by hexbin(), and has been deprecated in mpl 3.3 (#13696).
   if (py::bool_(py::cast(this).attr("get_hatch")())
       || offset_position == "data") {
     py::module::import("matplotlib.backend_bases")