Pdf rasterization has been bad for many years, a long time ago I reported this problem with complex graphics when thin lines appear in the image when saved to jpg. Previously, at least a pdf from indesign could be opened in photoshop, which had a different rasterization, but it has been the same for a long time, and when rasterizing SOME pdfs, it always creates thin lines in different places depending on the resolution...

Here is a sample QR directly generated in indesign when saved to jpg and in the preview in the application shows these thin lines!!!

I would like to point out that before photoshop had a different code for rasterization and it did not cause this, but now it is obviously the same...