This is a known issue with the Power Pages List control, specifically when:
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The list has wide columns that force horizontal scrolling
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Infinite scroll (“auto‑load more”) is enabled
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The browser has to recalculate layout repeatedly as new rows load
When these conditions combine, the virtualized grid sometimes fails to re‑render the middle rows, which results in the blank “gap” you’re seeing. Zooming or resizing forces a reflow, which is why the rows suddenly reappear.
You’re not the only one seeing this
Several customers have reported the same behaviour, especially after the newer list rendering updates rolled out. It’s more noticeable when:
So yes — this is reproducible and not specific to your environment.
Why it happens
Power Pages uses a virtualized grid for performance. Instead of rendering all rows, it renders only what’s visible. When the layout becomes unstable (due to overflow, resizing, or long lists), the virtualization engine sometimes loses track of row heights and leaves blank placeholders.
This is a UI bug — not a permissions or data issue.
What you can do right now
Until Microsoft patches this, the following workarounds help reduce or eliminate the issue:
1. Reduce column width or number of columns
The bug appears far less often when the grid fits without horizontal scrolling.
2. Disable infinite scroll
Switch the list to pagination instead of auto‑load.
This prevents the virtualization engine from recalculating layout mid‑scroll.
3. Set fixed column widths
In some cases, explicitly setting widths in the list configuration stabilizes rendering.
4. Avoid mixing horizontal + vertical scroll
If possible, redesign the list so only vertical scrolling is needed.
