System Information
Operating system: Windows 10 Pro 10.0.16299 Build 16299
Graphics card: NVIDIA GeForce GTX 1070

Blender Version

Date: 2019-01-14 11:43
Hash: 7707bf203c0f

Short description of error
When I try keyframing the End value under the Timing tab in ParticleSystem, the number keeps jumping back to 0.0 or whatever the previous number was.

Exact steps for others to reproduce the error

1. add particle system to object (in this case, "quick fur")
2. add keyframe in dope sheet and press I to add beginning keyframe on End
3. move to a new frame in dope sheet and then either slide or type in new value for End.
4. value keeps returning to previous keyframe value.

I've tried all the right-click options I can find, but none seem to make the new value stick.

Based on the default startup or an attached .blend file (as simple as possible).