Could not find another thread to post this issue, but when I started an English game now on ERAS, I saw colorful/firework-like visuals on distant scenery when I was in first-person sailing mode.
The issue occurs on all first person sea encounters during evening time.
And this problem I just recalled since last time I played; now is evidently occuring as well: after ship surrenders via paying tribute (or you paying them tribute just to end battle), you cannot exit screen until you sink them or get out of range. They still attack you and you still attack them but the white color flag marker is still on, and not red:
https://filebin.net/yplud7ac3ut0ieu5/SpraggeJr_QuickSave_2.zip?t=vx4a0mak
With reference to first issue of the colorful sparks on screen - I now spotted it once I landed at port: