Larget srcset transform failing

[ursbraem]

I'm submitting a...

• [x ] general question

Description

We have an image transform with a few srcset variants:

{% set transformedImages = craft.imager.transformImage(imageSource, [{ width: imageBaseWidth * 0.5 }, { width: imageBaseWidth * 0.75 }, { width: imageBaseWidth }, { width: imageBaseWidth * 1.5 }], { ratio: imageRatio, position: coordinates, format: 'webp' }) %}`
...
<img
  class="{{ imageClass }}"
  srcset="{{ craft.imager.srcset(transformedImages) }}"

Apparently, the largest transform fails sometimes, resulting in the image being 0 bytes and not displaying as broken in the frontend.

This does not happen when adding the image and rendering it in the firstplace, but over time.

Deleting the empty file and clearing Blitz Cache solves the error for the moment.

Can you help us debug it with a few hints?

• Why is the image regenerated in the first place? It should be generated once and for all, shouldn't it?
• Which are the memory limits we should look at?