Litchi is a different animal -...
But with all apps - the Firmware of the Drone remains the same -
FUll loss of signal may react as DJI says...
BUT on litchi theres a SMart return to home function - which Operates based on connection to the RC - and should climb to Max RTH and return straight... when Loss of signal
If you disable that - Litchi will CONTINUE its Path WITHOUT SIGNAL - and only enter RTH if the Remainder of the path is FURTHER than the Minimum battery power to RTH.
If Litchi sees that there is only the minimum Battery power to return home - … THen it will enter the Normal RTH based on Minimum Battery power.
On Litchi - the default is to return to home straight