diff --git a/lib/permissions/prefixes.js b/lib/permissions/prefixes.js
--- a/lib/permissions/prefixes.js
+++ b/lib/permissions/prefixes.js
@@ -68,6 +68,7 @@
 function includeThreadPermissionForThreadType(
   parsed: ParsedThreadPermissionString,
   threadType: ThreadType,
+  isMember: boolean,
 ): boolean {
   if (
     threadType !== threadTypes.COMMUNITY_OPEN_SUBTHREAD &&
@@ -83,6 +84,11 @@
       parsed.filterPrefix === threadPermissionFilterPrefixes.OPEN_TOP_LEVEL)
   ) {
     return false;
+  } else if (
+    !isMember &&
+    parsed.membershipPrefix === threadPermissionMembershipPrefixes.MEMBER
+  ) {
+    return false;
   }
   return true;
 }
diff --git a/lib/permissions/thread-permissions.js b/lib/permissions/thread-permissions.js
--- a/lib/permissions/thread-permissions.js
+++ b/lib/permissions/thread-permissions.js
@@ -83,11 +83,13 @@
 ): ?ThreadPermissionsBlob {
   let permissions: { [permission: string]: ThreadPermissionInfo } = {};
 
+  const isMember = !!rolePermissions;
+
   if (permissionsFromParent) {
     for (const permissionKey in permissionsFromParent) {
       const permissionValue = permissionsFromParent[permissionKey];
       const parsed = parseThreadPermissionString(permissionKey);
-      if (!includeThreadPermissionForThreadType(parsed, threadType)) {
+      if (!includeThreadPermissionForThreadType(parsed, threadType, isMember)) {
         continue;
       }
       if (parsed.propagationPrefix) {
@@ -127,7 +129,6 @@
     (permissions: ThreadPermissionsBlob),
     threadPermissions.VOICED_IN_ANNOUNCEMENT_CHANNELS,
   );
-  const isMember = !!rolePermissions;
 
   if (
     threadIsAnnouncementThread &&