Text lost when updating text of old version
Illustrator CC 2018.(No problem before 2017)
Updated text disappears when opening a file of old data such as version 10 or lower by a specific operation and updating the text portion.
・Prepare and open files of version 10 or lower
・To confirm whether to update the legacy text on the warning screen, click [OK] to not update
・Save immediately
・Open the saved file
・Click on the legacy text part with the mouse
・On the warning screen, click [Update]
→ The text that should have been updated disappears
Reported in the thread of Japan Forum.
https://forums.adobe.com/thread/2401111

We have the fix available in the latest release. Please update Illustrator using Adobe Creative Cloud application to the latest build for version Illustrator CC 22.1.
Please refer to our knowledge base FAQ – https://illustrator.uservoice.com/knowledgebase/articles/1844590 if you face difficulty in update.
Or get in touch with us at any of the other support channels – https://helpx.adobe.com/support.html
Warm Regards,
Ashutosh Chaturvedi | Sr. Quality Engineering Manager – Illustrator
Adobe. Make It an Experience.
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Grant Hubert commented
I'm having this error again in illustrator 23.1.1
I thought this was fixed?
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Grant commented
This bug is back in version 23.0 of illustrator. Any word on a fix?
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Grant Hubert commented
I'm still having this bug even with Illustrator CC 22.1. Is there something I'm doing wrong?
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Anish Kumar commented
Thanks for reporting this issue. We are able to reproduce this at our end and are looking into this.
Thanks
Anish Kumar
Illustrator Team