Hello, so I made this texture pack that is customized FaithfulVenom32x32 (only thing customized is icons.png), something I realized is that in my icons.png folder, there was no golden apple texture, when I would eat a golden apple the hearts would be black : An example and in the images i've added the icons.png image, if anybody knows how to add a golden apple texture, that would be great, i'll be answering question, I'm not too good with this kind of stuff so I might be getting some things wrong, thanks (I'm gonna feel dumb if there is a golden Apple texture XD)
Whatever you got there is missing 3 heart textures for normal and hardcore modes, the horse jump meter, and the two attack warm-up indicators.
In other words, I guess your texture might be from 1.7.
This is even older than 1.7, or 1.6 since all these things (aside from the attack indicators; the mounted animal hearts are also missing) were added in 1.6, including absorption hearts (the proper name for the yellow hearts) - you should always check the version and be careful when using a resource pack in a newer version than it was made for. Another possibility is that they downloaded it from some random site, not the official source: