diff --git a/app/models/metadata_has_many.rb b/app/models/metadata_has_many.rb
index b4db4454..a15f1241 100644
--- a/app/models/metadata_has_many.rb
+++ b/app/models/metadata_has_many.rb
@@ -42,6 +42,9 @@ class MetadataHasMany < MetadataRelatedPosts
     return true unless inverse?
 
     (had_many - has_many).each do |remove|
+      # No modificar nada si la relación ya estaba deshecha
+      next unless remove[inverse]&.value == post.uuid.value
+
       remove[inverse]&.value = remove[inverse].default_value
     end
 
diff --git a/app/views/posts/_htmx_form.haml b/app/views/posts/_htmx_form.haml
index 6968cda7..afa1b44c 100644
--- a/app/views/posts/_htmx_form.haml
+++ b/app/views/posts/_htmx_form.haml
@@ -75,6 +75,7 @@
     Enviamos valores vacíos o arrastrados desde el formulario anterior
     para los atributos ignorados
   - except.each do |attr|
-    %input{ type: 'hidden', name: "#{base}[#{attr}]", value: pluck_param(attr, optional: true) }
+    - if (value = pluck_param(attr, optional: true)).present?
+      %input{ type: 'hidden', name: "#{base}[#{attr}]", value: value }
 
 = yield(:post_form)
diff --git a/app/views/posts/modal.haml b/app/views/posts/modal.haml
index e589dfa8..93d7e6a5 100644
--- a/app/views/posts/modal.haml
+++ b/app/views/posts/modal.haml
@@ -59,7 +59,7 @@
         = render 'posts/attributes', site: site, post: post, dir: dir, base: base, locale: locale, except: except
         -# @todo Volver obligatorios?
         - except.each do |attr|
-          - if (value = pluck_param(attr, optional: true))
+          - if (value = pluck_param(attr, optional: true)).present?
             = hidden_field_tag "#{base}[#{attr}]", value
 
     - content_for :"#{modal_id}_footer" do