Exception error when updating tickets Server v8.13.6

[Troy E]

When updating tickets users are now getting this error

I checked the ticket and had them dump the txt to notepad and bring it back in, same errors when copied and pasted 

but typing gibberish directly in the ticket, works fine

(Jira admin and project admin can both type jibberish ok)

Exception occurred: com.atlassian.jira.exception.DataAccessException: org.ofbiz.core.entity.GenericEntityException: while inserting: [GenericEntity:ChangeItem][newvalue,null][field,description][oldstring

any idea , re-indexing or reboot it as a last resort (its 3k users)

[Nic Brough -Adaptavist-]

This is usually down to iffy content in the "text" that can't be stored by the database.    Are there any special characters in it at all?  I'm looking mainly for emojis or embedded images, but I'd want to just check if there are anything that might be a control character (so if it's not a-zA-Z0-9 or basic punctuation)