It seems that this more than 10000 errors is the result of saving a game without building a blue print (you do the blue print, then deselect the building manager without removing the blue print):
release-453 (x64)...s/construction_data/construction_data_component.luac:97: attempt to index field 'entity' (a nil value)stack traceback:
[C]: ?
...s/construction_data/construction_data_component.luac:97: in function 'set_contributes_to_score'
...s/construction_data/construction_data_component.luac:16: in function <...s/construction_data/construction_data_component.luac:15>