Green & Grassmann OK but Gröbner crashes with old RetroRendezvous save

[Growflavor]

Green & Grassmann successfully load in KSP 1.11.2 the old save at:

https://forum.kerbalspaceprogram.com/index.php?/topic/161390-principia-challenge-munar-retrograde-rendezvous-122/

However I get the following crash when trying to open the same save in KSP 1.11.2 with Gröbner:

Principia_ERROR_20210625_223123_15380.zip

`E0625 22:31:23.531883 22048 interface.cpp:691] Principia version 2021061011-Gröbner-0-g05ed8f86927035b5820d611536d711b3176db3d4 built on 2021-06-05T16:53:53Z by Microsoft Visual C++ version 192930037 for Windows x86-64

F0625 22:31:40.448882 22072 continuous_trajectory_body.hpp:489] Check failed: (continuous_trajectory->checkpointer_->ReadFromCheckpointAtOrBefore( desired_t_min)) == ::absl::OkStatus() (NOT_FOUND: No checkpoint vs. OK)`