cant change product custom field position in product backend

-- HikaShop version -- : 6.5.0
-- Joomla version -- : 6.1.1
-- PHP version -- : 8.3

Hi
Why can't I change the position of the custom field for the product type in version 6.5?
I created a Product Custom Field called intro_text.
On the product management page, in the Form customization section, I created a block called Intro info and moved the intro_text custom field into this new block. So far, everything is correct.
But when I tried to position this block next to the Description block, everything gets messed up and when I save the product page, the Intro info block goes back to its original position, at the bottom of all blocks.
This problem did not exist in version 6.1 And I could drag and drop to change the location of different blocks. In version 6.5 this could only be done with the Move up and Move down buttons, but the new block that is created does not have these buttons and the drag and drop function does not work either.