If there is a half-width space in Japanese and there is no half-width space on that line, a line break will be performed there. Please see the attachments.
This is not a Minecraft Translation Project issue.
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This ticket is a duplicate of MC-198700 and should be resolved.
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We're tracking this issue in MC-198700, so this ticket is being resolved and linked as a duplicate.
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For implementers: CJK sentences can have linebreak anywhere, unless
it causes a line to end with opening parenthesis (e.g. 「) OR
it causes a line to start with closing parenthesis (e.g. 」), punctuations (、 or 。), small letters (e.g. っ, ぁ, ゃ, ッ, ァ, ャ - note the difference between them and big letters つ、あ、や、ツ、ア、ヤ), or hyphens (ー、U+30FC).
Note that these are only some of the rules (known as kinsoku shori) but for regular usage these are enough. Rather than reinventing a wheel this should just be done via ICU4J calls.