.aix file is unnecessarily outlining text that is using Palatino Linotype font

When exporting from ArcGIS Pro, and opening the .aix files in Adobe Illustrator, there is an initial error warning saying "to preserve appearance, some text has been outlined" and my project has issues with some lines of text being outlined which makes it challenging to edit or reflow the text. There is no pattern to discern which lines of text are affected and no symbols in the lines of text that could cause an issue. It is completely random which lines of text are outlined and when re-exporting the same project layout from ArcGIS Pro the same lines of text are affected. I have only noticed this with the font Palatino Linotype so far. I have tried exporting from ArcGIS Pro using different fonts and they do not have the same issue.

Illustrator is updated to the newest version, the plugin ArcGIS Maps for Adobe Creative Cloud is on version 3.9, and ArcGIS is updated to the newest version.