Install generator not functioning on blank install with admin and starter theme.

[noltedesign]

Subscription generator isn't working out of the box with stock Solidus starter starter frontend.

Solidus Version:
4.3.5
Installed with starter frontend on Ruby 3.3.5 with Rails 7.1.4

To Reproduce

1. Spin up a new rails app
2. add solids and solids subscription gem
3. Run solidus install
4. run solidus subscription install
5. add a subscription
6. Get an error on cart_line_item path: Validation failed: Subscribable must exist, Subscribable can't be blank

Current behavior
Validation failed: Subscribable must exist, Subscribable can't be blank
extracted source:
def handle_subscription_line_items
line_item = @current_order.line_items.find_by(variant_id: params[:variant_id])
create_subscription_line_item(line_item)
end
end

Expected behavior
Installation of fields should appear normal and have options
Move onto Checkout when added to checkout
backend admin also has the 'subscription' option come and go based on other menu item I'm in.

Screenshots

Desktop (please complete the following information):

• OS: MacOS Sonomo
• Browser: FF
• Version: 131