Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce RTX 2080 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 451.67
Broken: version: 2.90.0, branch: master, commit date: 2020-08-31 11:26, hash: rB0330d1af29c0
Worked: not sure if it worked after 2.80, maybe it worked in 2.79, but I'm not sure.
Short description of error
If you animate the lifetime and bake the particles everything in the same blender session everything works correctly, no matter if you bake them to disk or to memory.
When you save the file, and open the file again the particle cache is broken and it's loading all the animation with the lifetime present in the first frame, no matter if it's a disk cache or a memory cache.
Exact steps for others to reproduce the error
Steps to reproduce:
You can watch the video I did or follow this steps:
1.- Open the attached blend file with Blender 2.90 release
2.- Clean the cache if there is one, change some parameter like particle count (don't touch particle lifetime, it's animated)
3.- Bake the animation, and you will see the correct result
4.- create a new file
5.- reload our test file
6.- you will see how the cache is not behaving correctly and it's ignoring the animated lifetime
It's impossible to trustworthy bake particles without this working, because not even the disk cache is working