diff --git a/tests/e2e/Actions/VoteAndReactTests.cs b/tests/e2e/Actions/VoteAndReactTests.cs
index 8dd4ac9..637d2a4 100644
--- a/tests/e2e/Actions/VoteAndReactTests.cs
+++ b/tests/e2e/Actions/VoteAndReactTests.cs
@@ -96,15 +96,23 @@ namespace decePubClient.E2E.Actions
 			await Results.Cell("client.action.react", origin, reference, async () =>
 			{
 				static int Count(JsonObject row) => row["reactions"]?[emoji]?.GetValue<int>() ?? 0;
+				var chip = card.Locator("[data-reactions] button").Filter(new() { HasText = emoji }).First;
+				// a run cut short may have left the persona's reaction: start from the withdrawn state
+				if (await chip.CountAsync() > 0 && ((await chip.GetAttributeAsync("class")) ?? "").Split(' ').Contains("btn-active"))
+				{
+					var left = Count(await Row(origin, uri));
+					await chip.ClickAsync();
+					await Pasture.Eventually(async () => Count(await Row(origin, uri)) < left, 60);
+				}
 				var before = Count(await Row(origin, uri));
 				await card.Locator("footer [title='React']").First.ClickAsync();
 				await card.GetByRole(AriaRole.Button, new() { Name = emoji, Exact = true }).First.ClickAsync();
 				await AcceptNoticeIfAsked(session.Page);
-				var chip = card.Locator("[data-reactions] button").Filter(new() { HasText = emoji }).First;
 				await Assertions.Expect(chip).ToHaveClassAsync(new System.Text.RegularExpressions.Regex("btn-active"), new() { Timeout = 15000 });
 				Assert.True(await Pasture.Eventually(async () => Count(await Row(origin, uri)) > before, 45),
 					$"the reaction never reached {origin}");
 
+				await chip.ScrollIntoViewIfNeededAsync();
 				await chip.ClickAsync();
 				Assert.True(await Pasture.Eventually(async () => Count(await Row(origin, uri)) == before, 60),
 					$"withdrawing the reaction never reached {origin}");
diff --git a/tests/e2e/Support/Results.cs b/tests/e2e/Support/Results.cs
index 66a56f3..6c74fb6 100644
--- a/tests/e2e/Support/Results.cs
+++ b/tests/e2e/Support/Results.cs
@@ -1,13 +1,27 @@
 using System.Text.Json;
+using System.Text.Json.Nodes;
+using System.Text.RegularExpressions;
 
 namespace decePubClient.E2E.Support
 {
 	// Each render and action test is also a cell of the town's matrix, appended to the pasture's out/client.jsonl in the
-	// cell format town.sh check writes, so report.html shows decePub next to the servers.
+	// cell format town.sh check writes, so report.html shows decePub next to the servers. A failure that an open gap of the
+	// town's gaps.json names (a peer's own bug, say) is skipped with the gap's id rather than failed, as the report counts
+	// it an expected failure.
 	public static class Results
 	{
 		static readonly object Gate = new();
 		static readonly string FilePath = Path.Combine(Pasture.Root, "out", "client.jsonl");
+		static readonly Lazy<JsonArray> Gaps = new(() => JsonNode.Parse(File.ReadAllText(Path.Combine(Pasture.Root, "town", "gaps.json")))!.AsArray());
+
+		// the open gap whose match (regular expressions over the cell's fields) fits this cell, if any
+		static string KnownGap(string feature, string origin)
+		{
+			var fields = new Dictionary<string, string> { ["feature"] = feature, ["origin"] = origin, ["observer"] = "decepub" };
+			return Gaps.Value.Where(g => g?["status"]?.GetValue<string>() != "closed" && g?["match"] is JsonObject)
+				.FirstOrDefault(g => g!["match"]!.AsObject().All(m => Regex.IsMatch(fields.GetValueOrDefault(m.Key, ""), $"^(?:{m.Value!.GetValue<string>()})$")))
+				?["id"]?.GetValue<string>();
+		}
 
 		public static async Task Cell(string feature, string origin, string reference, Func<Task> test) =>
 			await Cell(feature, origin, reference, test, page: null);
@@ -27,6 +41,8 @@ namespace decePubClient.E2E.Support
 				got = e.Message.Length > 400 ? e.Message[..400] : e.Message;
 				if (page is not null)
 					await SignIn.Evidence(page, $"{feature}-{origin}-{reference}".Replace('/', '_').Replace('@', '_'));
+				if (KnownGap(feature, origin) is { } gap)
+					Assert.Skip($"known gap {gap}: {got}");
 				throw;
 			}
 			finally