#431

backend/app/controllers/tags_controller.rb

@@ -802,7 +802,8 @@ class TagsController < ApplicationController
       affected_tags << alias_tag_name&.tag
     end
 
-    affected_tags.compact.uniq.each do |affected_tag|
+    affected_tags = affected_tags.compact.uniq(&:id)
+    affected_tags.each do |affected_tag|
       TagVersioning.ensure_snapshot!(affected_tag, created_by_user: current_user,
                                      language_code: locale.language_code)
     end
@@ -821,7 +822,10 @@ class TagsController < ApplicationController
       alias_tag_name.update!(tag:, primary_flg: false, auto_generated: false)
     end
 
-    affected_tags.compact.uniq.each do |affected_tag|
+    affected_tags.each do |affected_tag|
+      # update_all records this Tag after its parent relationships are updated.
+      next if affected_tag.id == tag.id
+
       record_tag_version!(affected_tag, event_type: :update,
                           created_by_user: current_user,
                           language_code: locale.language_code)

backend/app/controllers/wiki_pages_controller.rb

@@ -135,10 +135,10 @@ class WikiPagesController < ApplicationController
       name = title.delete_prefix(TagGroupRepr::PREFIX)
       parsed = TagGroupMarkdownParser.parse(body:, group: nil)
       group = TagGroupOperation.create!(
-          name:, **parsed.except(:compatibility_body), actor: current_user)
+          name:, **parsed.except(:compatibility_body), actor: current_user,
+          require_compatibility: true)
       version = current_group_version(group)
       return render_group_representation(TagGroupRepr.one(group), version,
-                                         body: parsed.fetch(:compatibility_body),
                                          status: :created)
     end
 
@@ -179,7 +179,8 @@ class WikiPagesController < ApplicationController
       name = title.delete_prefix(TagGroupRepr::PREFIX)
       parsed = TagGroupMarkdownParser.parse(body:, group:)
       TagGroupOperation.update!(
-          group:, name:, **parsed.except(:compatibility_body), actor: current_user)
+          group:, name:, **parsed.except(:compatibility_body), actor: current_user,
+          require_compatibility: true)
       return head :ok
     end