Originally reported here;
FTBTeam/FTB-Modpack-Issues#7295
MC: 1.21.1
Genetics: geneticsresequenced-1.21.1-1.5.4
Neoforge: 21.1.128
Pack: FTB Evoltuion v1.11.1
Genetics keep inventory gene causes any excess items that do not fit into main inventory to be erased, a tombstone generates but does not contain the overflowing items. on death
curio items & armor get placed into main inventory causing overflow