Ive got an issue on my 1.16.4 modded minecraft server where the textures of water and coloured glass disappear, if im far away they render ok and the ocean near my base is unaffected it is simple just the orange coloured glass, the little water lakes and my farms water that doesnt have the textures. what is weird tho is depending on how i look at the water and glass, as in the distance and orientation, the texture will reappear. Im not the only person with this problem as my mate also sees this error, i tried when i first started the server removing mods and seeing which one was an issue but non of the mods were causing the issue, we are all using the normal minecraft texture pack. Ive also tried to replicate this issue on a singleplayer world by placing all the blocks that could cause an issue.
I currently dont have access to my server but will tonight so here is a photo of all the mods on the server and all my client side mods.
EDIT:(ive just done more testing and found that the textures load when im not directly looking at the glass or water but when i directly look at them they disappear)