diff --git a/pkg/driver/devicelab/commands.go b/pkg/driver/devicelab/commands.go
index b0bb789..5ecd4cd 100644
--- a/pkg/driver/devicelab/commands.go
+++ b/pkg/driver/devicelab/commands.go
@@ -845,10 +845,15 @@ func (d *Driver) scrollByAdb(direction string, screenWidth, screenHeight int, pe
 const scrollDurationMs = 300
 
 // isElementOnScreen reports whether an element's bounds overlap the visible
-// viewport. Zero-area bounds count as off-screen.
+// viewport. Malformed bounds — non-positive width/height, e.g. a clipped
+// below-the-fold ScrollView child reported with top>bottom (negative height) —
+// count as off-screen, matching boundsTappable's #94 guard. Without this,
+// scrollUntilVisible short-circuits to success on a degenerate rect that tapOn
+// then refuses to tap ("element rect not tappable"), looping to the deadline
+// instead of scrolling the element fully into view.
 func isElementOnScreen(info *core.ElementInfo, screenWidth, screenHeight int) bool {
 	b := info.Bounds
-	if b.Width == 0 || b.Height == 0 {
+	if b.Width <= 0 || b.Height <= 0 {
 		return false
 	}
 	return b.X+b.Width > 0 && b.X < screenWidth && b.Y+b.Height > 0 && b.Y < screenHeight
diff --git a/pkg/driver/devicelab/commands_test.go b/pkg/driver/devicelab/commands_test.go
index 8f69225..6da0ec4 100644
--- a/pkg/driver/devicelab/commands_test.go
+++ b/pkg/driver/devicelab/commands_test.go
@@ -180,6 +180,13 @@ func TestIsElementOnScreen(t *testing.T) {
 		{"entirely right of screen", core.Bounds{X: 1080, Y: 100, Width: 200, Height: 200}, false},
 		{"zero width", core.Bounds{X: 100, Y: 100, Width: 0, Height: 200}, false},
 		{"zero height", core.Bounds{X: 100, Y: 100, Width: 200, Height: 0}, false},
+		{"negative width", core.Bounds{X: 100, Y: 100, Width: -50, Height: 200}, false},
+		// Repro from the field: a clipped below-the-fold ScrollView button the
+		// agent reports with top>bottom (raw [270,2300][1080,2274] → h=-26,
+		// centre (675,2287)). Overlaps the viewport numerically, but is a
+		// degenerate rect tapOn refuses (boundsTappable's #94 guard); the scroll
+		// success predicate must reject it too so the loop keeps scrolling.
+		{"negative height (clipped below-fold)", core.Bounds{X: 270, Y: 2300, Width: 810, Height: -26}, false},
 	}
 
 	for _, tt := range tests {
diff --git a/pkg/driver/uiautomator2/commands.go b/pkg/driver/uiautomator2/commands.go
index 054248a..8700ebe 100644
--- a/pkg/driver/uiautomator2/commands.go
+++ b/pkg/driver/uiautomator2/commands.go
@@ -523,10 +523,12 @@ func (d *Driver) scrollByAdb(direction string, screenWidth, screenHeight int, pe
 }
 
 // isElementOnScreen reports whether an element's bounds overlap the visible
-// viewport. Zero-area bounds count as off-screen.
+// viewport. Malformed bounds (non-positive width/height — e.g. a clipped rect
+// with top>bottom) count as off-screen, so scrollUntilVisible keeps scrolling
+// instead of declaring success on a degenerate rect.
 func isElementOnScreen(info *core.ElementInfo, screenWidth, screenHeight int) bool {
 	b := info.Bounds
-	if b.Width == 0 || b.Height == 0 {
+	if b.Width <= 0 || b.Height <= 0 {
 		return false
 	}
 	return b.X+b.Width > 0 && b.X < screenWidth && b.Y+b.Height > 0 && b.Y < screenHeight
diff --git a/pkg/driver/uiautomator2/commands_test.go b/pkg/driver/uiautomator2/commands_test.go
index 744db0e..2270172 100644
--- a/pkg/driver/uiautomator2/commands_test.go
+++ b/pkg/driver/uiautomator2/commands_test.go
@@ -4180,6 +4180,10 @@ func TestIsElementOnScreen(t *testing.T) {
 		{"entirely above screen", core.Bounds{X: 100, Y: -300, Width: 200, Height: 200}, false},
 		{"zero width", core.Bounds{X: 100, Y: 100, Width: 0, Height: 200}, false},
 		{"zero height", core.Bounds{X: 100, Y: 100, Width: 200, Height: 0}, false},
+		{"negative width", core.Bounds{X: 100, Y: 100, Width: -50, Height: 200}, false},
+		// Malformed clipped rect (top>bottom → negative height): degenerate, must
+		// count as off-screen so scrollUntilVisible keeps scrolling.
+		{"negative height (clipped)", core.Bounds{X: 270, Y: 2300, Width: 810, Height: -26}, false},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {