This is similar to losing your platoon due to engine shutdown, albeit different, as you lose your platoon before repairing even. Any damage that disables movement for your tank loses your platoon even before engine shutdown: so far I observed it with tracks, gearbox and steering. I guess "engine shutdown" simply falls under the same category, which may shine more light on the bug I reported here:   https://forum.il2sturmovik.com/topic/69642-tank-crew-platoon-repairs-1-bug-and-1-sugg