Indirect interpolation bug

[omry]

Minimal example:

transform:
  standard_transforms:
    pre_transforms:
    - transform: NormalizeScale
model:
  transforms: ${transform.standard_transforms}
dataset:
  pre_transforms: ${model.transforms.pre_transforms}

to trigger convert to container with OmegaConf.to_container().

[omry]

@odelalleau, can you check if your nested interpolation fix is accidentally solving this bug? :)
I think not but worth a shot.

[odelalleau]

@omry it doesn't (the code path is unchanged for "simple" interpolations involving a single ${..})