diff --git a/binary-compatibility-validator/reference-public-api/kotlinx-coroutines-debug.txt b/binary-compatibility-validator/reference-public-api/kotlinx-coroutines-debug.txt
index 604e6cd253..79f5b75d15 100644
--- a/binary-compatibility-validator/reference-public-api/kotlinx-coroutines-debug.txt
+++ b/binary-compatibility-validator/reference-public-api/kotlinx-coroutines-debug.txt
@@ -1,13 +1,9 @@
 public final class kotlinx/coroutines/debug/CoroutineInfo {
-	public final fun component1 ()Lkotlin/coroutines/CoroutineContext;
-	public final fun copy (Lkotlin/coroutines/CoroutineContext;Lkotlin/coroutines/jvm/internal/CoroutineStackFrame;J)Lkotlinx/coroutines/debug/CoroutineInfo;
-	public static synthetic fun copy$default (Lkotlinx/coroutines/debug/CoroutineInfo;Lkotlin/coroutines/CoroutineContext;Lkotlin/coroutines/jvm/internal/CoroutineStackFrame;JILjava/lang/Object;)Lkotlinx/coroutines/debug/CoroutineInfo;
-	public fun equals (Ljava/lang/Object;)Z
+	public final fun copy ()Lkotlinx/coroutines/debug/CoroutineInfo;
 	public final fun getContext ()Lkotlin/coroutines/CoroutineContext;
 	public final fun getCreationStackTrace ()Ljava/util/List;
 	public final fun getJob ()Lkotlinx/coroutines/Job;
 	public final fun getState ()Lkotlinx/coroutines/debug/State;
-	public fun hashCode ()I
 	public final fun lastObservedStackTrace ()Ljava/util/List;
 	public fun toString ()Ljava/lang/String;
 }
diff --git a/kotlinx-coroutines-debug/src/CoroutineInfo.kt b/kotlinx-coroutines-debug/src/CoroutineInfo.kt
index 56f391a203..84cd9f370e 100644
--- a/kotlinx-coroutines-debug/src/CoroutineInfo.kt
+++ b/kotlinx-coroutines-debug/src/CoroutineInfo.kt
@@ -14,7 +14,7 @@ import kotlin.coroutines.jvm.internal.*
  * Class describing coroutine info such as its context, state and stacktrace.
  */
 @ExperimentalCoroutinesApi
-public data class CoroutineInfo internal constructor(
+public class CoroutineInfo internal constructor(
     val context: CoroutineContext,
     private val creationStackBottom: CoroutineStackFrame,
     @JvmField internal val sequenceNumber: Long
@@ -44,14 +44,10 @@ public data class CoroutineInfo internal constructor(
     @JvmField
     internal var lastObservedFrame: CoroutineStackFrame? = null
 
-    // Copy constructor
-    internal constructor(coroutine: Continuation<*>, state: CoroutineInfo) : this(
-        coroutine.context,
-        state.creationStackBottom,
-        state.sequenceNumber
-    ) {
-        _state = state.state
-        this.lastObservedFrame = state.lastObservedFrame
+    public fun copy(): CoroutineInfo = CoroutineInfo(context, creationStackBottom, sequenceNumber).also {
+        it._state = _state
+        it.lastObservedFrame = lastObservedFrame
+        it.lastObservedThread = lastObservedThread
     }
 
     /**
@@ -94,6 +90,8 @@ public data class CoroutineInfo internal constructor(
             lastObservedThread = null
         }
     }
+
+    override fun toString(): String = "CoroutineInfo(state=$state,context=$context)"
 }
 
 /**
diff --git a/kotlinx-coroutines-debug/src/internal/DebugProbesImpl.kt b/kotlinx-coroutines-debug/src/internal/DebugProbesImpl.kt
index 29b1e36e09..b8b01c3587 100644
--- a/kotlinx-coroutines-debug/src/internal/DebugProbesImpl.kt
+++ b/kotlinx-coroutines-debug/src/internal/DebugProbesImpl.kt
@@ -80,7 +80,7 @@ internal object DebugProbesImpl {
         check(isInstalled) { "Debug probes are not installed" }
         val jobToStack = capturedCoroutines
             .filter { it.delegate.context[Job] != null }
-            .associateBy({ it.delegate.context[Job]!! }, {it.info})
+            .associateBy({ it.delegate.context[Job]!! }, { it.info })
         return buildString {
             job.build(jobToStack, this, "")
         }
@@ -118,7 +118,7 @@ internal object DebugProbesImpl {
     public fun dumpCoroutinesInfo(): List<CoroutineInfo> {
         check(isInstalled) { "Debug probes are not installed" }
         return capturedCoroutines.asSequence()
-            .map { CoroutineInfo(it.delegate, it.info) }
+            .map { it.info.copy() } // Copy as CoroutineInfo can be mutated concurrently by DebugProbes
             .sortedBy { it.sequenceNumber }
             .toList()
     }
@@ -373,7 +373,7 @@ internal object DebugProbesImpl {
     private fun <T : Throwable> sanitizeStackTrace(throwable: T): List<StackTraceElement> {
         val stackTrace = throwable.stackTrace
         val size = stackTrace.size
-        val probeIndex = stackTrace.indexOfLast { it.className ==  "kotlin.coroutines.jvm.internal.DebugProbesKt" }
+        val probeIndex = stackTrace.indexOfLast { it.className == "kotlin.coroutines.jvm.internal.DebugProbesKt" }
 
         if (!DebugProbes.sanitizeStackTraces) {
             return List(size - probeIndex) {
diff --git a/kotlinx-coroutines-debug/test/RunningThreadStackMergeTest.kt b/kotlinx-coroutines-debug/test/RunningThreadStackMergeTest.kt
index 3ccbe0ae00..c15fe89487 100644
--- a/kotlinx-coroutines-debug/test/RunningThreadStackMergeTest.kt
+++ b/kotlinx-coroutines-debug/test/RunningThreadStackMergeTest.kt
@@ -167,4 +167,15 @@ class RunningThreadStackMergeTest : DebugTestBase() {
         yield()
         assertTrue(true)
     }
+
+    @Test
+    fun testActiveThread() = runBlocking<Unit> {
+        launchCoroutine()
+        awaitCoroutineStarted()
+        val info = DebugProbes.dumpCoroutinesInfo().find { it.state == State.RUNNING }
+        assertNotNull(info)
+        @Suppress("INVISIBLE_MEMBER") // IDEA bug
+        assertNotNull(info.lastObservedThread)
+        coroutineBlocker.await()
+    }
 }