Describe the bug
Make sure to include:

1. Skill levels advancments to stay after death
2. All skill advancement and experience of skills reset after death

To Reproduce
Attention to detail is important!

1. Gain skill experience or level advancement in skills
2. Die and respawn

Meta Info

• TerraFirmaCraft-MC1.12.2-0.24.6.83
• Hwyla, JEI, Journeymap, theoneprobe
• No other mods necessary

I just observed this in my SSP, build 86