I guess it's because they pruned some data (especially the correct humanoid body structure) from SDXL 0.9 and then released SDXL 1.0, I used the same dataset, same network Rank, same network alpha to train the same character Lora with SDXL 0.9 and SDXL 1.0, and the result is that the SDXL 1.0 lora generated more bad anatomy images. Here are the files:
https://civitai.com/models/117366/character-ganyu-genshin-impact-sdxl09
https://civitai.com/models/117324/character-ganyu-genshin-impactsdxl10
The SDXL 1.0 lora with far more issues of bad hands (I didn't post it into sample images), such as:
And I hit far fewer bad body structure in SDXL 0.9...
I guess I should stay in SDXL 0.9...until any new information.
What you might want to know more:
https://civitai.com/articles/1457/sdxl-09-lora-in-sdxl-10-and-sdxl-10-lora-in-09