Position not saved when using allowDragging

[Former user]

Exactly what title says. Here's an example script:

// Set icon item
setIcon(<binniecore:field_kit>)

// Set title and description (resourcepack contains actual strings)
setTranslatedTitle("v1993.adv.forestry.field_kit.title")
setTranslatedDescription("v1993.adv.forestry.field_kit.description")

// Add a parent advancement. The syntax is "modid:folder/path/to/the/advancement/then/filename"
addParent("forestry:root")

// Set the position
//setPos(149,41)

// Adds criteria and returns it as an object
criteria = addCriteria("hasKit", "minecraft:inventory_changed")

// Adds the required item for the criteria. This is the item that needs to be in the player inventory.
criteria.addItem(<binniecore:field_kit>)

File does not get updated when dragging advancement around. Might be possibly related to using Linux?