[Bug] Non-deterministic behavior with multiple transforms

[sadsciencee]

I hope this is a skill issue but I think I've discovered a bug with transforms.

I'm experiencing non deterministic behavior when multiple transforms are activated from the same function. It appears that in some cases, my transform function will receive a cart that is already affected by the same transform.

For example I have a merge that takes 3x variant A and 1x variant B.

If the cart line makeup is

A x 3
B x 1

This is successfully transformed to

AB x1

If the cart line makeup is

A x 4
B x 1

This is successfully transformed to

AB x 1
A x 1

However I've noticed that when there are more combinations and instances of bundles, the input logs show the cart lines in the input are pre-transformed based on previous transforms in the cart

For example if I take the lines

AB x 1
A x 1

And increase the quantity of AB by one I would expect

AB x 2
A x 1

However instead I get a cart error and either the transform is dropped or misapplied in the cart.

I would expect my input in this situation to look like

A x 7
B x 2

But instead it comes in from the logs as

A x 1
A x 3
B x 1
A x 1
B x 1

And it's unclear from documentation as to the best method to transform this type of input into the correct output transform.