Vietnamese last word bug (duplicated letters)

[valkyrieglasc]

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Account name

kyrie_g

Account config

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Current Behavior

the site happen trouble handling Vietnamese words that have diacritics (ă, ặ, è, ẹ, ớ, etc.)
at first some word won't even get input.
// EXAMPLE: "đường" (the site will likely don't even record "d" at the start and every letters after that, I need to backspace sometimes for the site to input it)

the final word will always got duplicated with diacritics character
// EXAMPLE: cửa (after typed it all out it will showed as "cưửa" deleting and rewrite doesn't help)

Expected Behavior

base on those 2 examples I provided:
// EXAMPLE: "đường"
-> the site should input and show typed letters like normal

the final word will always got duplicated with diacritics character
// EXAMPLE: cửa
-> the site shouldn't duplicate letters with diacritics

Steps To Reproduce

1. use "words" or "time" mode.
2. type like normal (the 2 problems listed above will likely occur from here)

Environment

• OS: EndeavourOS
• Browser: Zen Browser (flatpak version)
• Browser Version: v1.19.5b

Anything else?

I did tried typing Vietnamese long before this update and none of those problem exist aside from the site flagged diacritics as "wrong" or "incorrect", I do want the devs to talk with someone who actually know how Vietnamese work especially the one who's using Telex type.

I also fcitx5 - unikey for Vietnamese

I'm happy to collaborate and answer more questions if it help the devs improve Vietnamese experience on this wonderful site!