When putting banners under stairs so that the very top of the banner shows, the banner turns black.
The banner returns to its normal color when a block is broken next to it, exposing the banner to the light. (As shown in the picture)
Steps to Reproduce:
1. Dig a 1 block deep hole
2. Place a banner in the hole
3. Place stairs over the top
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Comments 2
The banner is actually located in a dark spot, the block below has no light entering it, as such it has ligh level 0.
This is how blocks in general render, banners just happen to be a 1x1x1 block with a 1x2x1 model.
If you modify any model to have a larger than 1x1x1 model, you will see the exact same effect on every single block.
The only way to fix this would be lighting up the model based on the block space the (part of) the element is in, rather than the block space the block is in, or the issue would just be moved to custom models. I personally would like such a fix, but honestly, chances are extremely slim for such a change to be applied, as it required a major refactor for such a minor thing.
Can confirm that this is an issue. Also affects 20w51a.