I was playing Shadow the Hedgehog for PS2 through PCSX2 on EmuDeck on my SteamDeck. However, when I loaded into act 2, The bloom was overwhelming and it became unplayable:

After fiddling around with the graphics settings, I found out that the Override Texture Barriers setting was set to Automatic (default), but it needs to be on Force disabled

After changing the setting, it looked much better:

Another comparison: in stage 4, the lights from the black alien plant things also looks better with the setting set to disabled