I think its a Paragraph Style bug thats affecting the latest version of Illustrator 2025 version 29.7.1
I recently updated to version 29.7.1 of Illustrator 2025. All of a sudden my template file started crashed Illustrator at startup. The file opens in Illustrator 2024 - but not 2025. Troubleshooting the file - slowly deleting bits and pieces from the template file I managed to discover that the bit that was crashing Illustrator 2025 was a single block of text. The block of text has a Paragraph style in it and I think it might be this which is causing the crash (or it could be something else? Fonts). I've isolated the block and pasted it into the attached file. It should open in 2024 - but will probably crash the 2025 version.

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Richard, I can open the file just fine and make changes with the text within, in both GA 29.7.1 and Beta builds...
Have you tested this particular file you shared? Perhaps moving the object into another file has fixed the problem?
Just in case — please share the full file with the team, using sharewithai@adobe.com (please put the report’s link in the email, for backtracking it here, http://illustrator.uservoice.com/forums/601447/suggestions/50308635)