Tie/Link still elongate under pressure thrust exerted by expansion joint despite restricting the backward gap to 0.

I faced/noticed this issue while working on a project and decided to replicate the example "Tie rods modeled as a single two-point support" in AutoPIPE to double check based on a benchmark. The defined Tie/Link in the example elongates despite the fact that I have specified a rigid spring rate for the support and 0 gap backward.

communities.bentley.com/.../Tie-rods-modeled-as-a-single-two_2D00_point-support.DAT