This is a small visual bug with sea prism bricks involving walls. The bug occurs with all walls that I have tried while running on the stable 1.4 TmodLoader client (running on windows 11). When there is a wall behind a sea prism brick--and those walls are surrounded by other walls themselves--the block will render a single pixel of empty space to either side of itself within the tile it occupies. The top and bottom tiles are not effected.
This bug is always active
Active mods: Calamity mod
Windows 11
Yes; there is a graphics card
8 gb of ram
Singleplayer