When MC-259798 was fixed, it only fixed the issue for block outlines of translucent blocks.
However the issue still persists on blocks with render type cutout (ie. glass/grass) or opaque blocks with hitboxes not matching the model (ie. lectern).
This can be seen by comparing the block outline of a translucent block with a cutout block.
Since there are no translucent blocks with a detached hitbox, I remodeled a stained glass block for this comparison:
[media]
As you can see the outline does render correctly when the block its attached to is treated as translucent.
Steps to Reproduce:
Place grass next to water
Observed results
Water is not rendered behind the block outline
Expected Results
Water would be rendered behind the block outline
Related issues
is duplicated by
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This affects any blocks whose outline doesn't follow the block model. (ie. grass, lectern, chain)
[media][media]

I request the title and summary be changed to mine as it's more accurate and detailed.
Title: Block outlines of non-full non-translucent blocks cause translucent blocks not to render behind them in lower than "Fabulous" graphics settings.
Summary:
When MC-259798 was fixed, it only fixed the issue for block outlines of translucent blocks.
However the issue still persists on blocks with render type cutout (ie. leaves/grass) or opaque blocks with hitboxes not matching the model (ie. lectern).
This can be seen by comparing the block outline of a translucent block with a cutout block.
Since there are no translucent blocks with a detached hitbox, I remodeled a stained glass block for this comparison:
[media]
As you can see the outline does render correctly when the block its attached to is treated as translucent.
Steps to reproduce
Place grass next to water
Observed results
Water is not rendered behind the block outline
Expected Results
Water would be rendered behind the block outline