How to set collision layer of Tilemap in Godot

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Physics layers are part of the TileSet. You can change their values with Tileset.set_physics_layer_collision_layer() and TileSet.set_physics_layer_collision_mask() like:

extends Node

@onready var tile_map: TileMap = $TileMap

func _ready() -> void:
	await get_tree().create_timer(2).timeout
	tile_map.tile_set.set_physics_layer_collision_layer(0, 0)
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