hello, i got the same problem with you.
my project using playfab and varest too and run with unreal 4.24.3
“Fatal signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x4000004140000b in tid 23965 (TaskGraphHP 4), pid 23845 (MainThread-UE4”
it happens after switching from 4.23.1
have you solved your problem?