Change application on Reset !
App2 address is now 0x08018000 (not 0x08019F40), and 0x08018000 it's first address of bank 1.
From .map file :
.text.Reset_Handler
0x08023534 0x50 Projects/SW4STM32/startup_stm32l072xx.o
0x08023534 Reset_Handler
So we need to jump to 0x08023534, in order to init memory, system and go to main.