The bug

Programmer Art contains some texture files for blocks which are exact visual duplicates of the current versions of those textures. It appears that Programmer Art is only intended to contain texture files for block textures which have changed since 1.13. This duplication means that applying Programmer Art on top of another resource pack which is itself on top of the vanilla resources will have the corresponding textures in the middle custom resource pack overwritten, which should not happen.

Affected texture files

The following block texture files in Programmer Art are visually identical to the ones from vanilla:

• grass_block_side.png
• sugar_cane.png

How to fix

Delete these texture files from the Programmer Art resource pack.

Further notes

The following does not appear to have any gameplay impact, but Programmer Art also appears to contain pointless duplicates of several mcmeta files for animated textures, which should probably also be removed alongside the textures mentioned above as Programmer Art does not replace these textures:

• fire_0.png.mcmeta
• fire_1.png.mcmeta
• kelp.png.mcmeta
• kelp_plant.png.mcmeta
• lava_flow.png.mcmeta
• lava_still.png.mcmeta
• nether_portal.png.mcmeta
• sea_lantern.png.mcmeta
• seagrass.png.mcmeta
• tall_seagrass_bottom.png.mcmeta
• tall_seagrass_top.png.mcmeta
• water_flow.png.mcmeta
• water_still.png.mcmeta