Social Image Generator shows gibberish when post title is Japanese

[kaitohm]

Impacted plugin

Jetpack

Quick summary

If your post title is Japanese, then the title shown on the Social Image preview becomes gibberish.

This was reported by an A4A partner in Japan who has requested a swift remedy.

Steps to reproduce

1. Create a new post.
2. Set a Japanese title. For example, "美味しい寿司" (yummy sushi).
3. Set a featured image.
4. Toggle "Social Image preview".
5. Notice a row of 5-lines shown on the image preview.

Site owner impact

Fewer than 20% of the total website/platform users

Severity

Major

What other impact(s) does this issue have?

Agency or developer revenue

If a workaround is available, please outline it here.

No response

Platform (Simple and/or Atomic)

No response

[kaitohm]

Another report of this.

• WordPress.com post - https://hanabikoushien.com/0723-2/
• Shared post on Instagram - https://www.instagram.com/p/DMbinOaNLxg/