Initially pinned column is not shown in the grid when pinning config has no explicit column setting.

[gedinakova]

Description

The visible index of the pinned column is not properly determined, even if the template & the group columns are removed from the layout. If pinning config is not set, or columns position is explicitly specified, the issue is not present.

• igniteui-angular version: 20.1
• browser: N/A

Steps to reproduce

1. Run dev demos
2. Navigate to Hierarchical Grid
3. Check the columns in the first grid
4. Note the toolbar pinning button > 1 pinned column

Result

The ID column which should be pinned is not present at all.

Expected result

The ID column should be displayed at the first position.