Unable to type Japanese characters correctly in a table with Chrome 65+ in case that the more left cell is not empty

Summary

Japanese IME normally enters multiple letter combination entry state to express consonant+vowel letter such as "k" + "i" = "き", however the first consonant letter ( "k", in this example) is auto-committed in the Confluence editor, so the Japanese IME cannot enter the combination entry.

Environment

Client that runs the browser is

• Windows and macOS
• Chrome (Tested with ver. 65.0.3325.162)
• Microsoft IME (Japanese) , Google Japanese IME, and Mac IME (Japanese) (This means this occurs in any IME.)

Steps to Reproduce

1. Create a blank page and add elements as below.
2. Add a table.
3. Set IME to Japanese.
4. Type two letters in a cell (Consonant + Vowel)
   e.g.) Type "k"(Consonant) + "i"(Vowel).
5. Type No.4 letters again in a cell next to the No.4 cell
   e.g.) Type "k"(Consonant) + "i"(Vowel).

Expected Results

"k" + "i" should be always converted to "き". ("ki" = "き" in Japanese)
Firefox.mov

Actual Results

"k" + "i" becomes "kい". The initial consonant letter is auto-committed. ("i" = "い" in Japanese)
GoogleIME.mov
MicrosoftIME.mov

Notes

• Please note this symptom is different from the issue CONFSERVER-54326 because it reports that first letter is "ignored" while the letter is "auto-committed" in this case.
• This occurs only at the Chrome environment, and IE11 also has another issue(Cannot type double byte characters in Section through IE11). Firefox works fine.
• As long as crawling the web and testing, this is apparently coming from a common malfunction of Chrome v65.x, however it is suspected any implementation on the Confluence is triggering the malfunctioning.
• Evidences for the above statement are as below.
  • This has not occurred on Chrome v63.x and prior.
  • There are related articles outside Atlassian product,
    • Latest Chrome 65 update breaks start of CJK IME input · Issue #2009 · quilljs/quill · GitHub
    • 576573 - Japanese IME: First character is auto-committed on office extensions - chromium - Monorail (This is a bit old report, however still opened.)
    • Google Groups – Chrome 65 アップデート後 Slack で一文字目が意図せず確定される問題について

Workaround

• Delete the affected letter, and re-type the contents.
• Add an empty space before typing the first letter.
• Use Firefox browser.