diff --git a/app/assets/stylesheets/nav.css b/app/assets/stylesheets/nav.css
index 3a8836e84..b37201e1d 100644
--- a/app/assets/stylesheets/nav.css
+++ b/app/assets/stylesheets/nav.css
@@ -78,6 +78,7 @@
     overflow: hidden;
     padding-block-end: 0;
     scrollbar-gutter: stable both-edges;
+    z-index: var(--z-nav);
   }
 
   .nav__scroll-container {
diff --git a/app/models/notification.rb b/app/models/notification.rb
index 416506783..4b69dd6e6 100644
--- a/app/models/notification.rb
+++ b/app/models/notification.rb
@@ -12,7 +12,7 @@ class Notification < ApplicationRecord
 
   after_create_commit :broadcast_unread
   after_destroy_commit :broadcast_read
-  after_create :bundle
+  after_create_commit :bundle
 
   scope :preloaded, -> { preload(:creator, :account, source: [ :board, :creator ]) }
 
diff --git a/config/database.yml b/config/database.yml
index b7f1d3297..fe34b5eff 100644
--- a/config/database.yml
+++ b/config/database.yml
@@ -25,7 +25,8 @@ default: &default
   port: <%= ENV.fetch "FIZZY_DB_PORT", 3306 %>
   pool: 50
   timeout: 5000
-  <% end %>
+  variables:
+    transaction_isolation: READ-COMMITTED
 
 development:
   <% if use_sqlite %>