SUMMARY
When using the "Compress here" command in Dolphin on a directory, the resulting tarball or zip file has a filename which mangles the original name of the directory if it finishes with a single digit (like test-1.1).

This does not happen for directories whose names finish with more than a digit (like test-1.12).

STEPS TO REPRODUCE
1. Create a directory called test-1.1
2. Right click on it and select Compress > Here

OBSERVED RESULT
The proposed tarball and zip file will respectively have filenames:
test-1.tar.gz
test-1.zip

EXPECTED RESULT
The filenames of the compressed archives should respectively be:
test-1.1.tar.gz
test-1.1.zip

Repeating the experiment with a directory name of test-1.12 generates no issue whatsoever.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: openSUSE Tumbleweed + KDE Plasma
(available in About System)
KDE Plasma Version:  5.24.4
KDE Frameworks Version: 5.93.0
Qt Version: 5.12.2