No space character in front of the input port of an element with external tool

Scenario:

1. Open the Workflow Designer.
2. Add elements "Read File URL(s)" and "Write Plain Text".
3. Set "human_T1.fa" as the input file.
4. Add "Element with CMD" _common_data/scenarios/_regression/4295/test_4295.etc, with 2 ports ($in, $out) and command "echo $in > $out"
5. Connect elements "Read File URL(s)" > "Element with CMD" > "Write Plain Text".
6. Configure the /test_4295.etc input port.
7. Run the workflow.
   Expected result: There are no errors.
   Current result: There is an unexpected error:

   Can't run an executable file "echoD:/ugene/ugene/data/samples/FASTA/human_T1.fa" as it is. 
   

   There is no space character between "echo" and file name.

Affected test:
GUITest_regression_scenarios_test_4295