diff --git a/modules/mesh-build-go/cmd/mesh-build-go/levels.go b/modules/mesh-build-go/cmd/mesh-build-go/levels.go
index 27d38434..ea5bc596 100644
--- a/modules/mesh-build-go/cmd/mesh-build-go/levels.go
+++ b/modules/mesh-build-go/cmd/mesh-build-go/levels.go
@@ -192,7 +192,7 @@ func (r *reader) event(ev event) {
 		case "output":
 			// go test's own summary of a package ("PASS", "FAIL", "ok <pkg>", "FAIL <pkg>") is never a failure's
 			// words: a "PASS" before a "FAIL <pkg>" says only that the tests passed and the program failed after them.
-			switch l := strings.TrimSpace(ev.Output); {
+			switch l := strings.TrimRight(ev.Output, "\r\n"); {
 			case l == "PASS":
 				r.passed[ev.Package] = true
 			case summaryLine(l):
@@ -275,22 +275,24 @@ func clip(lines []string, cause string) string {
 	return strings.Join(kept, "\n")
 }
 
-// summaryLine says a line is go test's summary of a package: "PASS", "FAIL", "ok <pkg> <time>", "FAIL <pkg> <time>".
+// summaryLine says a line is go test's summary of a package, in go's exact forms only: "PASS" or "FAIL" alone,
+// "ok  \t<pkg>\t<time>" and "FAIL\t<pkg>\t<time>" (review round 1: a line of the package's own that starts "ok " is kept).
 func summaryLine(l string) bool {
-	return l == "PASS" || l == "FAIL" || strings.HasPrefix(l, "ok ") || strings.HasPrefix(l, "ok\t") || strings.HasPrefix(l, "FAIL\t") || strings.HasPrefix(l, "FAIL ")
+	return l == "PASS" || l == "FAIL" || strings.HasPrefix(l, "ok  \t") || strings.HasPrefix(l, "FAIL\t")
 }
 
 // causeOf is the cause in a failure's output that is not a test's assertion (issue 1901): a race the race detector
 // reported (raceCause); else the first "panic:" line, a timeout's with the tests it names as running; else the first
 // "fatal error:" (the runtime's) or "signal:" line (a test program killed); "" when there is none. It reads every line,
-// so a long goroutine dump after the panic cannot hide it.
+// so a long goroutine dump after the panic cannot hide it. **It matches only lines at column 0**, where go prints the
+// runtime's: a test's indented log line holding the same words is not the cause (review round 1).
 func causeOf(lines []string) string {
 	if race := raceCause(lines); race != "" {
 		return race
 	}
 	for _, prefix := range []string{"panic: ", "fatal error: ", "signal: "} {
 		for i, l := range lines {
-			l = strings.TrimSpace(l)
+			l = strings.TrimRight(l, "\r\n") // at column 0: an indented line is a test's own log, not the runtime's
 			if !strings.HasPrefix(l, prefix) {
 				continue
 			}
@@ -322,7 +324,7 @@ func causeOf(lines []string) string {
 func raceCause(lines []string) string {
 	at := -1
 	for i, l := range lines {
-		if strings.TrimSpace(l) == "WARNING: DATA RACE" {
+		if strings.TrimRight(l, "\r\n") == "WARNING: DATA RACE" { // at column 0, as causeOf
 			at = i
 			break
 		}
diff --git a/modules/mesh-build-go/cmd/mesh-build-go/package_cause_test.go b/modules/mesh-build-go/cmd/mesh-build-go/package_cause_test.go
index 8ba71687..cf002bbe 100644
--- a/modules/mesh-build-go/cmd/mesh-build-go/package_cause_test.go
+++ b/modules/mesh-build-go/cmd/mesh-build-go/package_cause_test.go
@@ -79,3 +79,25 @@ func TestAnAssertionKeepsItsOwnCause(t *testing.T) { // 1901/AC4
 		t.Errorf("1901/AC4: failures = %+v", res.Failed)
 	}
 }
+
+// go prints the runtime's lines ("panic:", "fatal error:", "signal:", "WARNING: DATA RACE") at column 0: a test's own
+// log line that holds the same words is indented, and is not the cause (review round 1). The fixture is the deeptimeout
+// capture with two log lines of the first running test added: a t.Logf and its indented continuation saying "panic:".
+func TestALoggedPanicIsNotTheCause(t *testing.T) { // 1901/AC4
+	raw, err := os.ReadFile("testdata/captured/go-test-json-pkg-deeptimeout.jsonl")
+	if err != nil {
+		t.Fatal(err)
+	}
+	lines := strings.SplitAfter(string(raw), "\n")
+	added := `{"Action":"output","Package":"example.com/deeptimeout","Test":"TestHoldsTheSeat","Output":"    p_test.go:9: the child said:\n"}` + "\n" +
+		`{"Action":"output","Package":"example.com/deeptimeout","Test":"TestHoldsTheSeat","Output":"        panic: child retried and recovered\n"}` + "\n" +
+		`{"Action":"output","Package":"example.com/deeptimeout","Test":"TestHoldsTheSeat","Output":"        WARNING: DATA RACE\n"}` + "\n"
+	out := strings.Join(lines[:10], "") + added + strings.Join(lines[10:], "")
+	res := &TestResult{}
+	rd := newReader(res, ".")
+	rd.read(out)
+	rd.finish()
+	if len(res.Failed) != 1 || !strings.HasPrefix(res.Failed[0].Cause, "panic: test timed out after 2s") {
+		t.Errorf("1901/AC4: failures = %+v, want the timeout's panic as the cause", res.Failed)
+	}
+}