Confused about instance defaults..

I have some objects that I instance. An example would be a Tileset, a Sprite (specifically a Trigger), and NPCs.

Now the tileset of course can be drawn on, sprites have instance properties that can be set, etc. I, by convention, drag at least the first instance into a "Master" sheet so there's always that first core instance. I can also drag multiple instances, and set each of them to have different instance variables. All of this works as expected.

But sometimes I get 'old' values when dragging new instances. For example, if I drag a new instance of Tileset into a layout, it will have one of the other layer's layouts by default, which I have to erase before I can draw new stuff on it. Similarly, I may drag a new trigger instance into a layout, and for whatever reason, its attributes default to a previous instance's attributes (even though I have one on the Master sheet).

SOMETIMES when I drag a tileset to a layout, it's blank as expected.

I'm really confused here. How does it decide what the 'default' state is?

It's because it picks the first instance overall, not the first one on that particular layout

Wonderful, so if I accidentally added it to a scene first, then to master, I'm kinda out of luck for that object type? Any way to fix this in the json files?

A common strat is to create a layout for an object bank, this then keeps all the default instances stored in there and you can refer back to them easily.

Yeah I've been doing that, but since I'm still new-ish I wasn't aware of the importance of making sure that first instance gets created in what I'm calling the "Master" sheet. I'll dig through the JSON and see if I can correct the 'first id' somewhere.

Yep you can do a search for all instances and it will be the one with lowest IID/UID.

Presumably you could use the templates feature to have direct control over what instance you copy from.