I had to adjust a setup pose's bones, which of course messes up all the animation position data.
I tried to import the animation data from a previous save where the animation is correct, and the import succeeded, but upon entering Animation mode and trying to load the newly imported animation data, the program crashes with below log.

Can y'all update on what the correct procedure is to adjust a Setup pose while preserving the animation data? Thanks.

Spine Launcher 4.1.10
Esoteric Software LLC (C) 2013-2022 | http://esotericsoftware.com
Windows 10 Pro amd64 10.0
NVIDIA Corporation, NVIDIA GeForce RTX 2070/PCIe/SSE2, 4.6.0 NVIDIA 516.94
Starting: Spine 4.1.19 Professional
Spine 4.1.19 Professional
Licensed to: *****, *****
Using customized hotkeys: hotkeys-1.txt
Started.
OpenAL 1.1, Default audio device
ERROR: An unexpected error has occurred:
[aioob] Index 64 out of bounds for length 64
at s.kPb.(:133)
at s.oHZ.(:170)
at s.kyl.(:33)
at s.inO.(:390)
at s.fSo.(:184)
at s.aDM.S(:111)
at s.rdK.(:53)
at s.aDM.S(:111)
at s.jkD.(:117)
at s.aDM.S(:111)
at s.jkD.(:117)
at s.EIg.(:285)
at s.aDM.S(:111)
at s.aDM.(:58)
at s.kMr.(:168)
at s.aDM.S(:111)
at s.aDM.(:58)
at s.kMr.(:168)
at s.aDM.S(:124)
at s.aDM.(:58)
at s.kMr.(:168)
at s.jkD.(:126)
at s.aDM.S(:111)
at s.aDM.(:58)
at s.waN.(:128)
at s.WKQ.C(:1019)
at s.EgJ.S(:487)
at s.VVR.run(:267)
<events>

The crash occurs when clicking the newly imported (blue-circled) walk animation in the Preview pane.

Hi Misaki!

The issue spanned 2 project files, but I've since cleaned things up and am moving forward manually remaking the animations in my current project and will just try to be more careful about adjusting the setup pose in the future. It should be straight-forward enough if y'all want to test out the process I documented in the screenshots with your own test project. I'll try out sometime your suggestion with the Adjust button in the Dopesheet view.