Here is a repository that recreates the issue: https://github.com/Dartui/strauss-prefix-error
Here is a change that is generated by Strauss: https://github.com/Dartui/strauss-prefix-error/pull/1/files

If you want to test that locally simply clone repository and run composer install.

TL;DR - Strauss replaces string values to the FQCN if it matches the name of the imported class that is used in the same file. Is it possible to exclude this behavior somehow? I've tried using exclude_from_prefix but without success