Some augments are not being processed

We are currently using a snapshot of Carbon of March 11.

Some augments in the model of one of our devices are not being picked up it seems. I have attached a minimal model to this ticket (which is the actual model, with all unnecessary parts removed, and with some types changed to string to avoid dragging in other models).

The structure is as follows:

• ietf-interfaces defines:
• container interfaces
• list interface

• bbf-sub-interfaces augments the interface with:
• container frame-processing
• container ingress-rule
• list rule
• container flexible-match

• bbf-sub-interface-tagging has 2 augments:
• an augment on flexible-match, which uses a grouping that defines:
• choice vlan-tag-match-type
• case match-all
• leaf match-all
• case untagged
• leaf untagged
• case vlan-tagged
• list tag
• leaf index
• a second augment, on the "tag" added by the first augment, which again uses a grouping that defines:
• container dot1q-tag -> this dot1q-tag is not found in the parsed model
  ...

The parsing is successful, no errors are generated, but the dot1q-tag of that last augment is not returned in the parsed model.