BC28 - Groups nested inside grid() with Visible toggled via CurrPage.Update(false) not rendered after initial page load

[robertbacu]

Describe the issue

BC version where it broke: 28.0
Last working version: 27.x

Description:
On a Card page where a group nested inside a grid() container has Visible = SectionsVisible
and SectionsVisible starts as false at page open, toggling SectionsVisible to true
and calling CurrPage.Update(false) in a field's OnValidate trigger does not cause the
group and its fields to appear in the web client.

The fields remain blank/invisible until Page Inspection (Ctrl+Alt+F1) is opened, which
triggers a full page re-render and the groups then display correctly.

Actual behaviour: Groups that were not in the DOM at initial render remain absent after CurrPage.Update(false).

Expected behavior

Expected behaviour: CurrPage.Update(false) should cause newly-visible groups (including those nested in grids) to render in the DOM.

Steps to reproduce

Minimal repro:

• Card page, SourceTable = any table
• A group nested inside a grid() with Visible = SectionsVisible where SectionsVisible = false on OnOpenPage
• A scan/lookup field whose OnValidate sets SectionsVisible := true and calls CurrPage.Update(false)
• Run on BC28 web client → groups do not appear after validate

Additional context

Workaround:
Move Visible = SectionsVisible from the inner nested group up to a top-level group
that is a direct child of area(content), above the grid() container.
This allows BC28's partial-update mechanism to correctly toggle visibility.

[JesperSchulz]

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