fischl’s mispronunciation is probably related to how she reads a lot but doesn’t hear the specific words in her day-to-day life, leading to her not pronouncing the words correctly!
hoyoverse has actually commissioned an ad specifically related to this
Version "Luna VIII" "Sunny Summer Fontinalia" Trailer | Genshin Impact
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From its reflection upon the water, we learn that the new moon has risen. Beneath the early summer night sky, we wander free and unhurried.
Snezhnaya Ecology Teaser - "Laws of the Bitter Frost" | Genshin Impact
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In Snezhnaya, those who brave the cruel cold follow their own laws of survival.
Every road guided by the light of the polestar will, in the end, lead to the same destination.