Hello,
Before trying a HTTPRequest, I want to simply print the object to change it later (TextureRect).
Scene is simple:

And HTTPRequest script even simplier:
extends HTTPRequest
onready var changery = get_node("TextureRect")
func _ready():
print (changery)

get_parent
works though, but I don't get why get-node
is not in this case.
On Ubuntu 21.04
Did you ever have this behavior?