With the release of Illustrator 2021 (v25.3), an issue with multiline text spacing has been discovered that only affects users of macOS Catalina (10.15) and Mojave (10.14).
This issue does not affect:
macOS Big Sur
Windows
Illustrator 2021 (v25.2.3) or previous
Multiline text is not often used in Astute Graphics' plugin dialogues, and this does not affect the performance of the plugins in any other way.
The image below shows the issue. The lower, correct display of multiline text is on the left. The incorrect spacing in Catalina and Mojave is on the right:
Astute Graphics will work to resolve this issue.