Some copper block variants and polished block variants have a shading mistake in their texture, within the lines that indicate the chiseled separation between the blocks there is a highlight pixels that should be a shading pixels instead. (I attached some screenshots for the better understanding of the problem and a texture pack with fixed textures)

list of blocks affected:

• All variants of copper_block
• All variants of chisheld_copper
• All variants of copper_bulb
• All variants of copper_grate
• polished_andesite
• polished_diorite
• polished_granite
• polished_deepslate
• polished_tuff
• quartz_block
• lapis_block
• chiseled_nether_bricks