Bulk convert shortens SOME filenames by 1 letter

Love this plugin, still testing and came across something strange. I noticed that after running a bulk convert on 12k images, after the job was complete everything look alright on my PC but my phone was showing me some missing images. A quick look and I noticed that the called avif files that didn’t load on mobile device, had a different name to the original jpg file. There is no rule to this, files have different length of names, none uses capital letters nor empty spaces in their names. But the result is, I have files that look like this:

project-name-branding.jpg is renamed to project-name-brandin.avif and while it loads on a desktop for some reason it doesn’t on a mobile. I had to manually check every page on a mobile device, then edit each page / post / project / etc and reupload the images with new names, and only then the mobile shows the newly uploaded and ‘on load’ converted avif file that has the same name as jpg file.