PDF reader inserts spaces between characters in Japanese annotations

Zotero 6.0.37
MacOS 14.3.1 (23D60)

I noticed this behavior in previous Zotero 6 iterations as well, but Zotero's PDF reader inserts spaces between two-byte characters in Japanese PDFs when annotating. Might also be true for other double-byte character sets (Chinese, Korean), but I have not verified this.

Example:

Zotero: “栄 養 に関 す る 知 識 を 多 く得 た と して も,そ れ が 日常 生 活 に お い て 実 行”

Acrobat: "栄養に関する知識を多く得たとしても,それが日常生活において実行"

Chrome: "栄 養 に関 す る知 識 を多 く得 た として も,そ れ が 日常 生活 に おいて実行"
Firefox: "栄 養 に関 す る 知 識 を 多 く得 た として も,そ れ が 日常 生 活 に お い て 実 行"

Safari: "栄養 に関する知識 を多く得たと しても,そ れが日常生活において実行"
Preview: "栄養 に関する知識 を多く得たと しても,そ れが日常生活において実行"
Skim: "栄養 に関する知識 を多く得たと しても,そ れが日常生活において実行"

Acrobat gets this right.
Mac-only apps (Preview, Skim, Safari) insert a few extraneous spaces.
Chrome and Firefox have similar issues, and are definitely worse than any of the apps above.
However, Zotero is alone in inserting spaces between almost all characters.

Given that the rendering is all over the place, is it safe to assume that this is a problem with PDFs and not with Zotero, and that there's therefore little chance of seeing a change in the future?
  • Could you test with Zotero 7 beta?
  • @martynas_b, sorry, but I've had too many problems with the beta and won't be trying Zotero 7 until it's out of beta and the addons I need have been updated.

    Perhaps someone else can try this, though?
  • Well, you can send the PDF file to support@zotero.org with a link to this thread.

    What are the problems of Zotero 7 beta aside from plugin issues?
  • I will send the file (though the problem, to be clear, is not with that file alone). Thank you.

    I reported several issues with the beta here in the forums. It was recommended that I roll back to Z6 and not participate in the beta, so nothing additional to report.
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