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Microgreen Issues
(piefedimages.s3.eu-central-003.backblazeb2.com)
Just recently starting growing microgreens. I had 2 trays that turned out excellent. My last tray and now this current one are doing as shown.
Look at the bottom of the stems near the soil
That looks like a seedling fungal infection to me. It could be numerous different species.
Seeing some fuz, but nothing that jumps out to me as more than root hairs. But maybe I don't know what I'm looking at. Trimmed it out to try and get a better look.
Pull out some plants. What you are looking for is an unhealthy looking portion of the stem near where the soil meets the stem. It can be above or below the surface.
You might need a magnifying glass or use the magnification lens of you phone camera.
https://hort.extension.wisc.edu/articles/damping/