yes the main concern is someone paying an invoice successfully and then someone (maybe same person or other) paying that invoice again from another wallet. 

another concern is if a payment looks stuck and making the payment again on another wallet. 

if a payment fails and you make the payment again then you are fine.

there's a wormhole attack here too that users dont need to worry about too much it's mostly a router level attack 

midnight_orange

bitcoin

Dark-LN Releases Preimage Stealer

no i don't believe so as the payment never found a route during the probing process.  

if i understand correctly this is related to invoice reuse after a prior successful payment 