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__WFI does not come back at interrupts when using WLCSP

With my sparkfun 52832 board, when I use the __WFI instruction and I set my device to generate interrupts on P04, the code returns when an interrupt is generated.
With the 52832 WLCSP (internal LDO configuration) it gets stuck at the __WFI instruction even when an interrupt happens. 
Is there a reason for it?
Is this a normal behavior?
Do I need to configure anything special?

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