@Razor12911,
Ok I already found a site that was capable to test my gigabit/hdd limits
Anyway, this link gives you 2 archives and FA bundle:
https://ufile.io/f/hjbf7
In FA bundle, I use
freearc.exe(GUI). In
bin\_EC\xtool\ directory are the relevant xtool files. Archives use
xtool.exe, so you overwrite one of different versions to that. I believe I used
v047 most of the time, but can't say for sure which one I used on those archives. However, none of them successfully unpacked under Win8.1.
You will be able to test
1F.arc to the almost end, which confirm that last chain with big chunk size set is the one problematic(see archive info from GUI). Inside
1R.arc is a single file and will bug out at the very beginning.
Please let me know what you think. Also if anyone will be able to unpack those without error, then it would confirm my suspicion about my Win8.1.
EDIT: Also, when creating new archive under Win8.1(same parameters), it will test and extract correctly. I tested it on "1R" content. Still don't believe this to be bitrot/disk corruption etc. More like different OS environment+HW is causing intolerance in between versions. Before I had Win7 and i5-4690K CPU. Now I have Win8.1 and Ryzen 5800X. This is not a good thing if the case, change of HW/OS should not affect decompression reliability.