iWidgets clock widget intermittently disappears until launcher redraw

After updating to Niagara Launcher v1.16.20, an iWidgets clock widget intermittently becomes invisible on the Home Screen. The widget itself is still present, but it is no longer rendered.

Pulling up the alphabet slider immediately makes the widget visible again, suggesting that a launcher redraw fixes the rendering temporarily.

When the widget is invisible, long-pressing where it should be does not open the widget menu. However, long-pressing the date still allows entering "Move & resize," confirming that the widget still exists even though it is not rendered.

Steps to reproduce:

1. Place an iWidgets clock widget on the Home Screen.

2. Use Niagara Launcher normally.

3. After some time, the widget becomes invisible.

4. Pull up the alphabet slider.

5. The widget immediately becomes visible again.

Expected behavior:
The widget should remain visible without requiring a launcher redraw.

Actual behavior:
The widget intermittently disappears and only reappears after a launcher redraw, such as pulling up the alphabet slider.