The bug
The borders between textures on water and lava do not line up pixel to pixel per block, resulting in a weird, broken look. This may be fixable by scaling up the texture as appropriate depending on the direction of flow (such as sqrt(2) for diagonal flowing), or having a unique texture for each flow direction instead of rotating the textures.
Related issues
relates to
Attachments
Comments


This is not a duplicate.

Agreed, it's not a duplicate of that report; tough I'm fairly certain this got reported before.

It's been this way since infdev 20100616, so I wouldn't doubt it.

Affects 1.13-pre4.

Please remove 2018-07-20_21.42.41.png as it is obviously completely unrelated.
Can confirm in 20w51a.
Can confirm in 21w05b.
Can confirm in 21w06a.
Can confirm in 1.16.5 and 21w08b.

Can confirm in 1.17.1.