Can confirm that one fix is to subscribe to Navigraph navdata. I just did and ILS is back at Origami LHR now.
I realise this is an €8 a month fix - but my thinking is that third-party add on airport sceneries are going to take a while to fix in lieu of a global change from Asobo, so this at least keeps me flying.
As and when it’s fixed I might end my Navigraph subscription.