It concerned the TextureEnder version at the time that I raised this ticket.
As far as I'm aware there hasn't been a release of an updated version.
This issue is only for zipped texture pack (since the tool asks for a zip location).
If you us a non zipped texture pack then it works ok.
I only raised this issue to try and cut down on the number of issues you may start to receive in the future.
So feel free to close it, if it's causing clutter 🙂
This issue also happens for me.
I use hundreds of villager spawners for proximity detectors.
All are set to spawn with zero health at specific co-ords.
The first villager spawns nearby randomly with full health (similar as reported above) and the subsequent spawns are correctly spawned.