Chest top, bottom, and inside textures swapped when a resource pack is applied
The first picture (normal looking chest, as expected to appear) is with no texture packs applied, the rest are with the Programmer Art pack applied. I tested this with another pack and had the same result.
Anything besides the default textures seem to cause a swap of textures on the chest, placing the top and bottom on the inside, and the inside on top and bottom.
I checked the packs in 1.14.4 and can confirm it's not the packs themselves swapping the textures.
Not sure if this counts being sorta texture pack related but thought it was worth reporting.