Just delete *all* the config snapshots

config/sync/config_snapshot.snapshot.config_sync.module.contact.yml

@@ -1,34 +0,0 @@
-uuid: 50422191-d0f6-432b-a0ef-06a0e9d384a6
-langcode: en
-status: true
-dependencies:
-  module:
-    - contact
-id: config_sync.module.contact
-snapshotSet: config_sync
-extensionType: module
-extensionName: contact
-items:
-  -
-    collection: ''
-    name: contact.form.personal
-    data:
-      langcode: en
-      status: true
-      dependencies: {  }
-      id: personal
-      label: 'Personal contact form'
-      recipients: {  }
-      reply: ''
-      weight: 0
-      message: 'Your message has been sent.'
-      redirect: ''
-  -
-    collection: ''
-    name: contact.settings
-    data:
-      default_form: feedback
-      flood:
-        limit: 5
-        interval: 3600
-      user_default_enabled: true