As of 19w38b (or officially, 19w39a), the chest texture is mapped to the chest model differently. That change has not reached the programmer art resource pack yet, causing the model do be textured incorrectly.
is duplicated by
MC-162154Chest textures scrambled in programmer art resource pack
MC-162173Chest opened texture on top and chest top in open texture
MC-162259The chest texture in programmer art resource pack is corrupted
MC-162314Block became weird like a chest mouth is top of the block
MC-162343Enchant glint is white instead of purple, chests have weird textures and are sometimes transparent when playing without 1.14 "Default" Textures