Reinstate the backup (don't lose it) and re-run the script while watching your error_log for potential php errors.

re-uploaded the k2/item/cache folder
run the script, I get this message:
.File: ee842e3019fee30e4ca87cc93974d54b.jpg SUCCESSFUL .File: e7c0584255fa6f2981e510285a9e9e4f.jpg SUCCESSFUL .File: 5d9bd784bfd234610bf8ba15e7ad6a4e.jpg SUCCESSFUL .File: 948378d6a67ac0d7c7c6728581b072ab.jpg SUCCESSFUL .File: 5483e331a9bace540b3a2478fc014e25.jpg SUCCESSFUL .File: 1d73e13563b8be946c0f00bab252d7ea.jpg SUCCESSFUL .File: 8b6e33345ac8d5ffd9cf0d107a7d9e9d.jpg SUCCESSFUL .File: aaa082d2257ab65aecf61c2340e9c5b9.jpg SUCCESSFUL .File: 36fdb1a35cd2f54f95cf2119fb5bc7ed.jpg SUCCESSFUL .File: 88f135a483ef01fac8d7b920488085e4.jpg SUCCESSFUL .

no error in log file
again, only a few dozen of files in cache was recreated, I see the old ones for the rest

No Fatal Errors then.
I think you need to address this issue to the extension's dev.

Hello,
I'm sorry my english is bad.
I try the precedent php script.
As no change.
Images from k2 principal elements are wrong.
An idea ?
thanks

Hello,

You need to address this issue to the extension's developer since we did not develop it.
You can try reaching out to him through Github.

thank you!
Its very helpful.

You 're welcome :)