Fading background lighting of buttons with TAA

Hi everyone! Maybe someone can shed some light on me … I’m using MSFS in TAA mode because for me this provides decent performance, sharp displays and a good anti aliasing. But I really wonder why there’s a noticable fading in the background lighting of buttons. For example when I switch on the APU in the Fenix A320, turn off the packs etc. the background lighting of the respective buttons fades in really slow. I never saw this with FXAA or DLSS … Is this a known behaviour? What causes this and is there a fix? Thanks in advance!

(Ryzen 7 5800X3D, RTX3080, 32 GB, Win 11)