Was playing Genshin and I noticed Tlazolli's voice sounds way more different than it did before. I also noticed quite a few lines (by many characters) were a little off. Some did not match the captions and were off by a word or two, others felt like they weren't quite matching the sentence structure based on the punctuation (almost as if they were reading it out loud for the first time and didn't quite understand where to pause or take a breath, or which words to put emphasis on). It wasn't quite as noticeable in the archon quest, but I've only just started Xilonen's quest and I've noticed it several times in a span of 5 minutes.
There's not proof for this, but my theory is that these were early drafts of the voice lines and weren't intended to be the final product (similar to what happened with Barabara's voice when the game first launched). I have a feeling that they had recorded a bunch of these "beta lines" as a first draft, but due to the strike they were unable to get better takes. This would explain the reason why some of the lines are slightly off.
I find the absence of voices for Kinich, Kachina, and Ajaw to be indicative that the strike hit literally as they were recording the voices for 5.1, so it's not unreasonable to assume some of the VAs got to record a rough draft before being unable to continue.
As for Tlazolli in particular, I wonder if they recorded all her lines at once (for both 5.0 and 5.1) as a rough draft, then they "found her voice" and did a proper recording of the 5.0 audio with the intention of doing 5.1 later. But since that never happened, they just went with the rough draft so there could be SOME sort of voice.
I'm curious to see if they replace the audio files once the strike is over. That said, I want it to be clear I fully support the VAs with this strike, I just like theorizing about behind the scenes stuff.