ActiveRecord Jsonb backend - fallbacks: true does not work

[testa19]

Context

We started to use mobility for some existing tables. Decided not to remove the old field as there are queries that use the filed (we just save :en variant to the field in a before hook)

Falbacks do not work for jsonb backend.

 translates :title, backend: :jsonb, column_suffix: '_i18n', fallbacks: true

item = Item.find 3
=> #<Item:0x00000001094bd098
 id: 3,
 title: "Controller",
 primary_title: false,
 created_at: Tue, 08 Mar 2022 12:41:53.904284000 UTC +00:00,
 updated_at: Tue, 08 Mar 2022 12:41:53.904725000 UTC +00:00,
 title_i18n: {"en"=>"Controller"}>
I18n.with_locale(:en) { item.title }
=> "Controller"

item = Item.find 3
I18n.with_locale(:fi) { item.title }
=> nil

 translates :title, backend: :jsonb, column_suffix: '_i18n', fallbacks: { fi: :en }

item = Item.find 3
=> #<Item:0x00000001094bd098
 id: 3,
 title: "Controller",
 primary_title: false,
 created_at: Tue, 08 Mar 2022 12:41:53.904284000 UTC +00:00,
 updated_at: Tue, 08 Mar 2022 12:41:53.904725000 UTC +00:00,
 title_i18n: {"en"=>"Controller"}>
I18n.with_locale(:en) { item.title }
=> "Controller"

item = Item.find 3
I18n.with_locale(:fi) { item.title }
=> "Controller"

Expected Behavior

 translates :title, backend: :jsonb, column_suffix: '_i18n', fallbacks: true

item = Item.find 3
=> #<Item:0x00000001094bd098
 id: 3,
 title: "Controller",
 primary_title: false,
 created_at: Tue, 08 Mar 2022 12:41:53.904284000 UTC +00:00,
 updated_at: Tue, 08 Mar 2022 12:41:53.904725000 UTC +00:00,
 title_i18n: {"en"=>"Controller"}>
I18n.with_locale(:en) { item.title }
=> "Controller"

item = Item.find 3
I18n.with_locale(:fi) { item.title }
=> "Controller"

Actual Behavior

 translates :title, backend: :jsonb, column_suffix: '_i18n', fallbacks: true

item = Item.find 3
=> #<Item:0x00000001094bd098
 id: 3,
 title: "Controller",
 primary_title: false,
 created_at: Tue, 08 Mar 2022 12:41:53.904284000 UTC +00:00,
 updated_at: Tue, 08 Mar 2022 12:41:53.904725000 UTC +00:00,
 title_i18n: {"en"=>"Controller"}>
I18n.with_locale(:en) { item.title }
=> "Controller"

item = Item.find 3
I18n.with_locale(:fi) { item.title }
=> nil

Config

Mobility.configure do
  # PLUGINS
  plugins do
    backend :key_value

    active_record

    reader
    writer

    backend_reader

    query

    cache

    fallbacks

    presence


    locale_accessors

  end
end

[testa19]

Ok, it was me being stupid - the fallback was turned off for the dev environment