Describe the problem
The react component for the compound expansion table is missing the gray border that displays below the expanded row.
How do you reproduce the problem?
Compare the react example against the html example.
The react example is missing a gray bottom-border on the expanded row, as shown in this example:

Expected behavior
A gray bottom-border should display for the expanded row, as shown in this example:

Is this issue blocking you?
This is a cosmetic issue, so it's not blocking functionality.
Screenshots
See examples above.
What is your product and what release date are you targeting?
This is related to an upcoming release for RHOAI.
Any other information?