Vendor and Armory in skirmish I added won't turn into ruins

In skirmishes of FE8, I placed a Vendor and Armory in Ephraim’s Chapter 13 and Chapter 17 alongside a complimentary arena; the arena works but you cannot access the Vendor and Armory like I thought you’d be able to. I tried turning them into a ruin, but they won’t turn to ruins even after setting a tile change for it. How do I turn the Armory and Vendor into Ruins while keeping the Arena as is?

It works for Bethroen, so why doesn’t it work for this? Sorry for the noob question.

(post deleted by author)

Don’t.

Can you post the code written for the tile change event? People will probably be able to give better help if they have a direct look at the potential root of the problem (the eventing being possibly wrong) instead of going in blind with guesses in order to be actually helpful in their replies.

Wait, there’s a tile change event? Where do I go to access that?

Right, apologies. I rarely post on here, so I forgot, admittedly.

I’ll try to see where I can look for the code for the event, but pointers for how skirmishes/map code works would be nice.

There’s the World Map Skirmishes editor, but frankly the events there are a mess that I didn’t want to look into further. I think it would be easier if you made the default be a ruin, then in your non-skirmish chapter turn ON a tile change with a vendor\armory.