We have some instances where the SCP-Task tries to create a remote directory named after the file that should've been uploaded.

E.g. we tried uploading a file "main.min.js", which resulted in:
"Creating remote directory 'dist/js/main.min.js'..
[...]
Copy Failed. Some files were not uploaded successfully.
'dist/js/main.min.js' was not uploaded."

First assumption was a problem with files containing a dot in the filename itself. But we also have files like this, which are uploaded successfully.

One interesting differentiation for the "main.min.js"-case is the fact that we have files in the same directory called "main.min.js.src" and "main.min.js.map". Could this be related?

In another instance of this problem, we had a file called "name_of_file.pdf" which was sitting alongside a file "name_of_file.pdf_old". Which, too, resulted in this error.

We are using "Atlassian Bamboo version 4.4.4 build 3506" and "Bamboo SCP and SSH Tasks Version: 1.18"