Expected result: the shading is displayed as it is applied in the settings, also when making an adjustment.

Actual result: When opening the Indesign file, the shading is displayed correctly. But when a change is made in the area with paragraph shading, the shading randomly disappears in some places and the edges of the shading are not displayed correctly, which makes it impossible to make accurate changes in the shading. In the pdf, the shading is displayed correctly, as it is applied in the settings. So no problem there. It is merely when working in Indesign that the display of the shading is faulty.

Reproduce: make an adjustment in the shaded area. Text in colums, anchored objects in text, placed images, shading merged

Indesign 2025, 20.1