Unable to delete attached file record

Hello,

I'm in V11.1.5.
I create attachment for a project (files test.png), I works and i can show the file content from ProjeQtOr).
I get error from log : cannot create image thumb of size 32 for ....)
I want to delete attachment, nothing append.
In reality, file is deleted from server (in ../files/attach) but record stay in database.
Log show error : 'stSaveRefType' is not an expected status in result
Attachment still on screen, unable to show files (normal, it's deleted).
When trying to download, nothing append an an error (logical) is logged : download.php : XXXX not found.

Trying the same with .pdf, the same thinks appends.

Log file attached.

Regards,

 

PHP 8.1.4

Problem occurs on two differents instances, one in V11.1.4, one in V11.1.5

Exact, permissions are only rwxr--r-- on files and subdirectories...
It works for thumb creation but i still have problem while deleting attachment.

I'm trying deleting all subdirectories in attach and removing all records from database to see if issue occurs after that