diff --git a/packages/experimental/src/EventJournal.ts b/packages/experimental/src/EventJournal.ts
index d0ad25635f1..8eb4e273ea3 100644
--- a/packages/experimental/src/EventJournal.ts
+++ b/packages/experimental/src/EventJournal.ts
@@ -274,7 +274,7 @@ export const makeMemory: Effect.Effect<typeof EventJournal.Service> = Effect.gen
         const uncommittedRemotes: Array<RemoteEntry> = []
         const uncommitted: Array<Entry> = []
         for (const remoteEntry of options.entries) {
-          if (!byId.has(remoteEntry.entry.idString)) {
+          if (byId.has(remoteEntry.entry.idString)) {
             if (remoteEntry.remoteSequence > remote.sequence) {
               remote.sequence = remoteEntry.remoteSequence
             }
diff --git a/packages/experimental/src/Reactivity.ts b/packages/experimental/src/Reactivity.ts
index 333f8207de4..0da5072e5c2 100644
--- a/packages/experimental/src/Reactivity.ts
+++ b/packages/experimental/src/Reactivity.ts
@@ -72,17 +72,29 @@ export const make = Effect.sync(() => {
       const results = yield* Mailbox.make<A, E>()
       const runFork = yield* FiberHandle.makeRuntime<R>()
 
-      const handledEffect = Effect.matchCause(effect, {
-        onFailure(cause) {
-          results.unsafeDone(Exit.failCause(cause))
-        },
-        onSuccess(a) {
-          results.unsafeOffer(a)
+      let running = false
+      let pending = false
+      const handleExit = (exit: Exit.Exit<A, E>) => {
+        if (exit._tag === "Failure") {
+          results.unsafeDone(Exit.failCause(exit.cause))
+        } else {
+          results.unsafeOffer(exit.value)
         }
-      })
+        if (pending) {
+          pending = false
+          run()
+        } else {
+          running = false
+        }
+      }
 
       function run() {
-        runFork(handledEffect, { onlyIfMissing: true })
+        if (running) {
+          pending = true
+          return
+        }
+        running = true
+        runFork(effect).addObserver(handleExit)
       }
 
       yield* Scope.addFinalizer(