Paypal payer en 4x ne s'affiche plus

-- url of the page with the problem -- : ndnfragrance.com
-- HikaShop version -- : 6.5.0
-- Joomla version -- : 6.4.5
-- PHP version -- : 8.3.23

Hi,
On the product page, under the product name it was written "payer en 4x avec paypal".
Since the last update from 6.1.0>6.5.0, the sentence disappeared.
The code is still there as I can see <span id="zoid-paypal-message-uid......"
In the console, it seems to have a 422 error with message GET " www.paypal.com/credit-presentment/smart/...&client_id=BAAAf6EhR ....."

If I check the show_default.php the code is "<?php if(!empty($this->element->extraData->rightMiddle)) { echo implode("\r\n",$this->element->extraData->rightMiddle); } ?>"

So I guess, the problem should b in rightMiddle.... But no idea where is that rightMiddle and even if I could find that, I don't know what creates the error.

Do you have any clue?

Thank you for your reply.

To be sure I do the right thing, you ask me to install the 6.5.0 hikashop essential package?