I figured out that the stereo was fluctuating which was not an issue in the previous version. These fluctuations aren't exactly frequent, but you could pick up when it was more stereo and when it was more mono.
I initially thought this was applied everywhere on my phone but the issue seems to be only in FL Mobile. I tried to screen record the issue, but the recording actually didn't pick up the stereo fluctuations (unfortunately), only further supporting the FL Mobile exclusivity.
And yea this is getting quite annoying now. I don't even know if y'all even able to fix the issue or whatnot, especially giving nobody else is reporting this and I'm unable to share the issue with a screen recording. I may as well be stuck with this until I get a new phone
In case you need the info, my phone is a Samsung Galaxy A52 5G, a 2021 midrange.