Unable to create nested groups - grouping flattens structure

Product & version:
Adobe Express (Web)

Platform:
Browser (Chrome, latest version)

Steps to reproduce:

1. Create multiple elements.
2. Group some elements together (Group A).
3. Create another group (Group B) or select additional elements.
4. Try to group Group A with Group B (or with other elements).

Expected result:
Groups should remain nested (group inside another group), preserving hierarchy.

Actual result:
All elements are flattened into a single group.
Previous group structure is lost (including animations applied to those groups), and elements are no longer grouped into sub-groups.

Impact:
Creates a messy structure when working with many elements.
Reduces control and organisation in more complex designs.