diff --git a/Core/include/Acts/TrackFinding/CombinatorialKalmanFilter.hpp b/Core/include/Acts/TrackFinding/CombinatorialKalmanFilter.hpp
index 0bc2e5680cc..90a7ab5f134 100644
--- a/Core/include/Acts/TrackFinding/CombinatorialKalmanFilter.hpp
+++ b/Core/include/Acts/TrackFinding/CombinatorialKalmanFilter.hpp
@@ -746,7 +746,7 @@ class CombinatorialKalmanFilter {
       }
 
       // Transport the covariance to the surface
-      if (isHole || isMaterialOnly) {
+      if (isMaterialOnly) {
         stepper.transportCovarianceToCurvilinear(state.stepping);
       } else {
         stepper.transportCovarianceToBound(state.stepping, *surface);
diff --git a/Examples/Python/tests/root_file_hashes.txt b/Examples/Python/tests/root_file_hashes.txt
index 666cb676c39..ab5e04706bb 100644
--- a/Examples/Python/tests/root_file_hashes.txt
+++ b/Examples/Python/tests/root_file_hashes.txt
@@ -33,21 +33,21 @@ test_digitization_example_input[smeared]__particles.root: 669d0304eb8bcf244aa627
 test_digitization_example_input[smeared]__measurements.root: 243c2f69b7b0db9dbeaa7494d4ea0f3dd1691dc90f16e10df6c0491ff4dc7d62
 test_digitization_example_input[geometric]__particles.root: 669d0304eb8bcf244aa627809a117944e5e3b994fdfcfb8710f2b9a8f9a62d3b
 test_digitization_example_input[geometric]__measurements.root: 63ec81635979058fb8976f94455bf490cf92b7b142c4a05cc39de6225f5de2fb
-test_ckf_tracks_example[generic-full_seeding]__trackstates_ckf.root: ec6487dfca5f944cfacfef903eb4b9a97f8f6a668d07f77d0c3ec45c68054824
-test_ckf_tracks_example[generic-full_seeding]__tracksummary_ckf.root: 84085bcc63562cfb1b4c70d2665bf06938ac559bb40c2b01c076e1d8b5c7b43b
+test_ckf_tracks_example[generic-full_seeding]__trackstates_ckf.root: f0b4c6018d0b2641024b88f6ac717f16a2ca486007c2e9bf166c85dc5e161739
+test_ckf_tracks_example[generic-full_seeding]__tracksummary_ckf.root: e5187591a0902d7214dd211adf459e2ec43b200b43c7ebdb90e5af50ee828f91
 test_ckf_tracks_example[generic-full_seeding]__performance_seeding_trees.root: 0e0676ffafdb27112fbda50d1cf627859fa745760f98073261dcf6db3f2f991e
-test_ckf_tracks_example[generic-truth_estimated]__trackstates_ckf.root: 8e15cceeef4b115708596702988925b7506d39e0531dc5534636ec411a9b4ca2
-test_ckf_tracks_example[generic-truth_estimated]__tracksummary_ckf.root: 8e0116c656e1cc67446d54a5205c4a3e2f4c1fc90fa551bb608c881877dfa0ab
+test_ckf_tracks_example[generic-truth_estimated]__trackstates_ckf.root: 1d3198e1926cf2c568d1c854c3ec7d638ed296163ac3cd1ff68273ab21a12657
+test_ckf_tracks_example[generic-truth_estimated]__tracksummary_ckf.root: 0b0266b28e20efab834b74e816ed9c658527496f6ef55ca8c073133aae0825b1
 test_ckf_tracks_example[generic-truth_estimated]__performance_seeding.root: 1facb05c066221f6361b61f015cdf0918e94d9f3fce2269ec7b6a4dffeb2bc7e
-test_ckf_tracks_example[generic-truth_smeared]__trackstates_ckf.root: 82a6744980553e6274df78eea15f0dec22676b1c04e14afc3828bff9bbf5e1b1
-test_ckf_tracks_example[generic-truth_smeared]__tracksummary_ckf.root: 06d6ae1d05cb611b19df3c59531997c9b0108f5ef6027d76c4827bd2d9edb921
-test_ckf_tracks_example[odd-full_seeding]__trackstates_ckf.root: 53a96c225ed78bd7da1491ae3ff4173f0e6c8bffe27e3eab1ab7adfe55426080
+test_ckf_tracks_example[generic-truth_smeared]__trackstates_ckf.root: d043c7d28772954fa2c1e4b320384c26589586bc4cdd95e0506fab59a37135d7
+test_ckf_tracks_example[generic-truth_smeared]__tracksummary_ckf.root: f063e4ab1f7f55106fa8b61bac627ca4739f04434ee35c77db603910a6e1a747
+test_ckf_tracks_example[odd-full_seeding]__trackstates_ckf.root: d5388653cf5613e765e6ce1e5afe94d94ff5182d7734e75251bc415f0192f444
 test_ckf_tracks_example[odd-full_seeding]__tracksummary_ckf.root: 2a98d8ec8fae97e18f4661580b71885f558d7222f94bca5edfbf5cdb595021f7
 test_ckf_tracks_example[odd-full_seeding]__performance_seeding_trees.root: 43c58577aafe07645e5660c4f43904efadf91d8cda45c5c04c248bbe0f59814f
-test_ckf_tracks_example[odd-truth_estimated]__trackstates_ckf.root: 7ec5f4b24fa69bfc9d812a6f224d74d36df2d0a42aef791ae0116f309d6f1433
+test_ckf_tracks_example[odd-truth_estimated]__trackstates_ckf.root: 6ed8f0db3f3e7f1b71b6d9da7371597d4fb5f95b3d2f2ab18be43d1763ce41c1
 test_ckf_tracks_example[odd-truth_estimated]__tracksummary_ckf.root: 1eaae038ced2cc5c757480ca42eab60cdaff14d812c34a807a841267d6bfa110
 test_ckf_tracks_example[odd-truth_estimated]__performance_seeding.root: 1a36b7017e59f1c08602ef3c2cb0483c51df248f112e3780c66594110719c575
-test_ckf_tracks_example[odd-truth_smeared]__trackstates_ckf.root: 35a65e15a6f479f628a96f56ee78e1ac371d71a686ee0c974944d681499fe6bd
+test_ckf_tracks_example[odd-truth_smeared]__trackstates_ckf.root: a519202b1233d8e7aac3c9038ee6e16b5d3cdfe2027212d6900e00ee0fcec21d
 test_ckf_tracks_example[odd-truth_smeared]__tracksummary_ckf.root: 3e257de624674fa9a19dcc72598c78c29a52633821acaa56dc2aa39a1395f1b5
 test_vertex_fitting_reading[Truth-False-100]__performance_vertexing.root: 76ef6084d758dfdfc0151ddec2170e12d73394424e3dac4ffe46f0f339ec8293
 test_vertex_fitting_reading[Iterative-False-100]__performance_vertexing.root: 60372210c830a04f95ceb78c6c68a9b0de217746ff59e8e73053750c837b57eb