Constant-valued term maps contained rr:termType and the constant value changed from Literal to IRI after running docker container

[s-minoo]

Describe the bug
Running the Docker instance to generate the data will return an incorrect CSV RML mapping document in the output dataset files.
All the rr:constant values are explicitly changed to RDF literals instead of keeping their original RDF term.
That is, if there is an rr:constant gtfs:Stop defined in the RML mapping, the docker will transform it into rr:constant "http://vocab.gtfs.org/terms#Stop"; rr:termType rr:IRI instead.

To Reproduce
Steps to reproduce the behavior:

1. Run docker image docker run --pull always -itv "$(pwd)":/output oegdataintegration/gtfs-bench
2. Choose CSV data format and data scale of 1
3. See the generated RML document

Expected behavior
These rr:constant statements should not be changed at all.
In fact, the generated RML document from the docker image contains non-human readable Turtle format (i.e., a lot of anonymous IRIs generated with indirect links between different RDF statements) instead of just returning the mapping files in the mappings folder of the repo.

Screenshots or Video

Expected rr:constant:

Actual rr:constant:

Resources (please complete the following information):

• OS: Linux
• Docker: Yes
• Data Format(s): CSV
• Data Size: 1