diff --git a/fuzzers/FRET/src/systemstate/observers.rs b/fuzzers/FRET/src/systemstate/observers.rs
index 4c30b6bcc9..bee3bfbab9 100644
--- a/fuzzers/FRET/src/systemstate/observers.rs
+++ b/fuzzers/FRET/src/systemstate/observers.rs
@@ -398,14 +398,17 @@ fn get_release_response_pairs(rel: &Vec<(u64, String)>, resp: &Vec<(u64, String)
             if ready.contains_key(&next_resp.1) {
                 if ready[&next_resp.1] >= next_resp.0 {
                     if let Some(lr) = last_response.get(&next_resp.1) {
-                        maybe_error = true;
-                        // eprintln!("Task {} response at {:.1}ms before next release at {:.1}ms. Fallback to last response at {:.1}ms.", next_resp.1, crate::time::clock::tick_to_time(next_resp.0).as_micros() as f32/1000.0, crate::time::clock::tick_to_time(ready[&next_resp.1]).as_micros() as f32/1000.0, crate::time::clock::tick_to_time(*lr).as_micros() as f32/1000.0);
+                        if u128::abs_diff(crate::time::clock::tick_to_time(next_resp.0).as_micros(), crate::time::clock::tick_to_time(*lr).as_micros()) > 500 { // tolerate pending notifications for 500us
+                            maybe_error = true;
+                            // eprintln!("Task {} response at {:.1}ms before next release at {:.1}ms. Fallback to last response at {:.1}ms.", next_resp.1, crate::time::clock::tick_to_time(next_resp.0).as_micros() as f32/1000.0, crate::time::clock::tick_to_time(ready[&next_resp.1]).as_micros() as f32/1000.0, crate::time::clock::tick_to_time(*lr).as_micros() as f32/1000.0);
+                        }
                         // Sometimes a task is released immediately after a response. This might not be detected.
                         // Assume that the release occured with the last response
                         ret.push((*lr, next_resp.0, next_resp.1.clone()));
                         last_response.insert(&next_resp.1, next_resp.0);
                     } else {
-                    // eprintln!("Task {} released after response", next_resp.1);
+                        maybe_error = true;
+                        // eprintln!("Task {} released after response", next_resp.1);
                     }
                 } else {
                     // assert!(peek_resp.0 >= ready[&peek_resp.1]);
@@ -414,15 +417,18 @@ fn get_release_response_pairs(rel: &Vec<(u64, String)>, resp: &Vec<(u64, String)
                     ready.remove(&next_resp.1);
                 }
             } else {
-                maybe_error = true;
                 if let Some(lr) = last_response.get(&next_resp.1) {
-                    // eprintln!("Task {} response at {:.1}ms not found in ready list. Fallback to last release at {:.1}ms.", next_resp.1, crate::time::clock::tick_to_time(next_resp.0).as_micros() as f32/1000.0, crate::time::clock::tick_to_time(*lr).as_micros() as f32/1000.0);
-                    // Sometimes a task is released immediately after a response. This might not be detected.
+                    if u128::abs_diff(crate::time::clock::tick_to_time(next_resp.0).as_micros(), crate::time::clock::tick_to_time(*lr).as_micros()) > 500 { // tolerate pending notifications for 500us
+                        maybe_error = true;
+                        // eprintln!("Task {} response at {:.1}ms not found in ready list. Fallback to last response at {:.1}ms.", next_resp.1, crate::time::clock::tick_to_time(next_resp.0).as_micros() as f32/1000.0, crate::time::clock::tick_to_time(*lr).as_micros() as f32/1000.0);
+                    }
+                    // Sometimes a task is released immediately after a response (e.g. pending notification). This might not be detected.
                     // Assume that the release occured with the last response
                     ret.push((*lr, next_resp.0, next_resp.1.clone()));
                     last_response.insert(&next_resp.1, next_resp.0);
                 } else {
-                    eprintln!("Task {} response at {:.1}ms not found in ready list", next_resp.1, crate::time::clock::tick_to_time(next_resp.0).as_micros() as f32/1000.0);
+                    maybe_error = true;
+                    // eprintln!("Task {} response at {:.1}ms not found in ready list", next_resp.1, crate::time::clock::tick_to_time(next_resp.0).as_micros() as f32/1000.0);
                 }
             }
         } else {