diff --git a/packages/studio/tests/e2e/edit-accuracy/ratchet.mjs b/packages/studio/tests/e2e/edit-accuracy/ratchet.mjs
index 99ab1efe6f9..9adc2c22e3f 100644
--- a/packages/studio/tests/e2e/edit-accuracy/ratchet.mjs
+++ b/packages/studio/tests/e2e/edit-accuracy/ratchet.mjs
@@ -55,7 +55,17 @@ export function bankable(runs) {
  * Cases a real Studio race flips run to run, with the PR fixing it: measured and listed every run, never gated.
  * The fixing PR deletes its own ids here and re-banks them in the same PR.
  */
-export const QUARANTINED = {};
+export const QUARANTINED = {
+  // Undo or redo of a keyframed plain element restores the bytes but sometimes leaves the box 230-400px off.
+  "seqplainkeys-none-center-r0-nested-z100": "#6989",
+  "seqplainkeys-none-center-r0-root-z100": "#6989",
+  "seqplainkeys-none-center-r30-root-z100": "#6989",
+  "seqplainkeys-none-pct-r0-root-z100": "#6989",
+  "seqplainkeys-none-pct-r30-root-z100": "#6989",
+  "seqplainkeys-none-px-r0-nested-z100": "#6989",
+  "seqplainkeys-none-px-r30-nested-z100": "#6989",
+  "seqplainkeys-none-px-r30-root-z100": "#6989",
+};
 
 /**
  * Every run of every case: each shard's run plus the re-runs of the cases it flipped. `scope`, for a run of