Only first title of characteristic variant show on product page

-- HikaShop version -- : 4.0.1
-- Joomla version -- : 3.9.0

Hi,

I'm facing an issue on the product page, product got many characteristicsand for each only the first title of characteristic is showing

I checked the configuration and turned "On" the "Display the characteristics name" but this doesn't solve this issue
The display of characteristic is "dropdown"

When i dump the "$characteristic" var in the "displayFE" function near the title rendered (Line 227) [HikashopCharacteristicType]
The first characteristic got a "characteristic_value" prop (for the title) but not for the other characteristic (other start with an "values" prop)

Hi,

I erased all override and reinstalled 4.0.1 but nothing changed (bug on 4.0.0 too)

Tested on protostar template too

Well, i understand where the issue came from, this is not a bug from product view,

We are importing all products via CSV import, the issue i on our CSV eg:

Main product line :

product_name	product_parent_id	product_quantity	product_code	product_type	...	Dimension	Couleur
test	0	-1	010203	main	...	10x10

Variant line :

product_name	product_parent_id	product_quantity	product_code	product_type	...	Dimension	Couleur
	010203	-1	010203-1	variant	...	10x10	blue

product_name	product_parent_id	product_quantity	product_code	product_type	...	Dimension	Couleur
	010203	-1	010203-2	variant	...	10x20	red

So if main product is missing "Couleur" but if all variant of this product got "Couleur", when showing on frontend, this lead to what we got actually
In administrator area, when editing product i can see only "Dimension" on the "characteristic" field but seem hikashop saved all variant possibility of "Couleur"

Sry about my bad english