diff --git a/tests/libslic3r/test_wipe_tower_estimate.cpp b/tests/libslic3r/test_wipe_tower_estimate.cpp
index 51ab7a7620..db11db3e74 100644
--- a/tests/libslic3r/test_wipe_tower_estimate.cpp
+++ b/tests/libslic3r/test_wipe_tower_estimate.cpp
@@ -180,38 +180,6 @@ TEST_CASE("A single filament only gets a tower when one is printed anyway", "[Wi
     CHECK_THAT(estimate(config, 1, 0.2, 5.).depth, WithinAbs(WipeTower::get_limit_depth_by_height(5.f), 1e-9));
 }
 
-TEST_CASE("A single filament still gets a tower when the flush matrix purges", "[WipeTowerEstimate]") {
-    // SEMM + purge_in_prime_tower purges the flush matrix, whose average is non-zero for one
-    // filament (empty or not - filament_minimal_purge_on_wipe_tower folds in at 15 mm3). So the
-    // estimate reports a tower here while normalize_fdm_2 clears it: this answers how big a
-    // tower is, never whether there is one. Reading a non-zero depth as "a tower is printed"
-    // reserves space for, or blocks on, a phantom.
-    DynamicPrintConfig config = make_config();
-    config.set_key_value("single_extruder_multi_material", new ConfigOptionBool(true));
-    config.set_key_value("purge_in_prime_tower", new ConfigOptionBool(true));
-    // One nozzle, two filaments: a 2x2 block, so the fold over nozzles has one term.
-    config.set_key_value("flush_volumes_matrix", new ConfigOptionFloats({0., 140., 140., 0.}));
-
-    CHECK(estimate(config, 1, 0.2, 100.).depth > 0.);
-
-    // Type1 is the exception: the flush volume replaces Type2's purge volume, while Type1 decides
-    // from its per-filament purge list, and one filament is never changed to. A Type1 printer
-    // therefore reserves nothing here - and the scene draws nothing either, since it reads the
-    // same estimate, so the two still agree. Type2 is the default for every non-Bambu printer,
-    // which is what an IDEX/IQEX printer is.
-    CHECK_THAT(estimate(config, 1, 0.2, 100., WipeTowerType::Type1).depth, WithinAbs(0., 1e-9));
-
-    // The disagreement itself: same config, and the slicer's own rule prints no tower.
-    DynamicPrintConfig normalized = config;
-    normalized.set_key_value("enable_prime_tower", new ConfigOptionBool(true));
-    normalized.normalize_fdm_2(/*num_objects=*/1, /*used_filaments=*/1);
-    CHECK_FALSE(normalized.option<ConfigOptionBool>("enable_prime_tower")->value);
-
-    // Same plate, same matrix, purging back in the object: nothing to reserve.
-    config.set_key_value("purge_in_prime_tower", new ConfigOptionBool(false));
-    CHECK_THAT(estimate(config, 1, 0.2, 100.).depth, WithinAbs(0., 1e-9));
-}
-
 TEST_CASE("A tool change reserves a tower even with nothing to purge", "[WipeTowerEstimate]") {
     // The purge volumes are configurable down to zero, but the tool changes are still printed
     // on the tower and both planners still floor it - so the estimate has to floor it too.