This has nothing to do with the virus and everything to do with FLStudio. So I recommend going to the official FL forum and asking the developers why, after 10 years of development, they still didn't implement real-time latency compensation and real-time export into their software. The problem is Image line has decided to make sure their software caters to amateurs, and as powerful as the program is, it will never be a choice for producers using hardware, as the support for it in FLStudio is abysmal.
And just to make sure you understand where I'm coming from, I've been using FLStudio for over a decade, know it inside out, loved it to death, and watched it grow from a silly loop tool into the software studio it is today. But as soon as I started using hardware, I had to switch to cubase. Not because I wanted to, but because FL makes it frustratingly hard to use hardware synths in their program, primarily because they still can't handle the latency any external hardware will produce. Not because external hardware has latency, but because their signal must must travel through the PC which does have it. Hence, until they get with the program and implement real-time latency compensation and real-time export like pretty much every other program out there, no hardware user will ever make FLStudio their 1st choice. Not when there are so many great DAW's out there which make it a breeze to work with external gear. There are workarounds to all this, but they completely kill the workflow and make it a chore to use the virus inside FLstudio.
What baffles me, however, is that Image line is actually contributing to the bad rep FLStudio has/had of being an "amateur audio program" by blatantly ignoring any needs of the professional, and focusing exclusively on the amateur and/or software/only user.