Grid lines on image after using Composite module.

Is there an existing issue for this?

• I checked and did not find my issue in the already reported ones

Describe the bug

When adding a composite module layer, feint lines appear in a grid pattern.
I am using several iterations of the composite module at different opacities ie 50%, 33%, 25% etc to reduce high ISO noise, a grid becomes visible and more obvious as more overlays are added and the noise is reduced and then the image exposure is increased.
The lines are visible when "high quality processing" is toggled on or the image is viewed at 100%.

The grid lines persist in the exported image.

This happens whether or not I have "darktable preferences > processing > activate OpenCL support" checked or unchecked.

Steps to reproduce

• Open the composite module
• Add an image to overlay
• Increase exposure

Expected behavior

darktable should produce a clean image

Logfile | Screenshot | Screencast

video_driver.log

common.log

opencl.log

Commit

No response

Where did you obtain darktable from?

OBS build

darktable version

5.0.1

What OS are you using?

Linux

What is the version of your OS?

Ubuntu 22.04.5 LTS

Describe your system

Processor: AMD® A8-3870 apu with radeon(tm) hd graphics × 4
RAM: 16.0 GiB
Graphics Card: Radeon RX 550 Series (polaris11, LLVM 15.0.3, DRM 3.57, 6.8.0-87-generic)

OS: Ubuntu 22.04.5 LTS
Gnome: 42.9
Windowing System: X11

Are you using OpenCL GPU in darktable?

Yes

If yes, what is the GPU card and driver?

Radeon RX 550 Series 4GB

Please provide additional context if applicable. You can attach files too, but might need to rename to .txt or .zip

PB087209_01.ORF.xmp.txt

Start by reproducing the grid artifact in the composite module with the supplied ORF/XMP files, exposure increase, and high-quality processing enabled; compare behavior with OpenCL enabled and disabled. Review the attached video_driver.log, common.log, and opencl.log for relevant errors. Done means the exported image is clean and no grid appears at 100% view.