Drizzt Saga introduces offset errors which make GemRB saves unplayable in vanilla engine or Shadowkeeper.
It's entirely bug in the mod itself and not GemRB. See this topic for the details.

https://www.gibberlings3.net/forums/topic/2...;comment=264948
or
The Gibberlings Three Forums → Tools & Resources → GemRB → bg1 save game compatibility: creature names