Transport threshold of FTFP_BERT_LIV?

Geant4 Version:11.3.2
Operating System:windows11
Compiler/Version:Microsoft Visual Studio Commnity 2022
*CMake Version:*3.24.202208181-MSVC_2

The energy of the electrons that have traveled a certain distance in ScH2 with random enrgy is obtained.

When I used Shielding, the lowest energy was higher than 1keV.

When I used FTFP_BERT_LIV, the lowest energy was higher than 100eV.

It seems the electrons that have lower energy than 1keV in shielding and 100eV in FTFP_BERT_LIV is stopped at that point

Are there transport threshold in each physics lists?

Thanks.