Spreadsheet do not accept a First multi-byte character

[ultrakanji]

This could be reproduce in Spreadsheet demo site.

When I enter some multi-byte characters in a cell, a first character is accepted as single byte character just like attached file.
(In Japanese, type "a" when I want to enter "あ". In attached file case, it should be "あ" not "aあ". )

This problem was also seen in the initial google spreadsheet.
I strongly hope this could be fixed because this is Pro tool.

Conditions:

• version: 2.1.0.alpha1
• browser: Chrome, Edge