diff --git a/tests/KNOWN_FAILING_TESTS b/tests/KNOWN_FAILING_TESTS
index 2aa1a04978..ba34b718a7 100644
--- a/tests/KNOWN_FAILING_TESTS
+++ b/tests/KNOWN_FAILING_TESTS
@@ -11,6 +11,7 @@
 solidcraft-cli::action_matrix::action_matrix_sample 3 baseline actions fail on SMLib: 2 shells (Bad Loop Orient on issue-616-lid-ribs; status 1001 on filleted-shelled-box, shelled again open at an inner wall), 1 fillet (SmSurfOfRevolution Test #7 on oblique_cut_of_cylinder)
 solidcraft-cli::naming_corpus::corpus_designs_name_alike_every_build_and_fail_where_a_reference_is_gone oracle/83-boundary-loop-thicken does not load: step 8, SMLib thicken status 1001
 solidcraft-engine::tests::fillet_fit_taper_closes_to_a_point SMLib fillet status 1001 on the taper fit (radius 16 closing to 0)
+solidcraft-engine::tests::shell_tangent_chain_that_opens_every_face_explains_how_to_keep_walls SMLib shell status 1034 on a box with all 12 edges rounded (Ball corners since 5e8c9c1), opened at one face (tangency-labs/smlib#102)
 solidcraft-kernel::blend::corner_tests::a_round_ending_in_an_earlier_round_matches_both_together SMLib fillet status 1001 on the round that ends in the earlier one
 solidcraft-kernel::blend::corner_tests::corner_blends_hold_at_any_scale at 0.01x a picked edge runs on tangentially into an unblended edge and SMLib's result is not a closed solid (the smooth-vertex End, tangency-labs/smlib#81)
 solidcraft-kernel::blend_corner::tests::issue2422_vertical_after_separate_bottom_rounds SMLib's check refuses the fillet: edge and vertex tolerance 0.97 against the body's 0.01 (#2422)