We encountered this error message when transferring simple text comments to rich text comments. This is alluded to here: https://www.ptc.com/en/support/article/CS297322?source=search where it mentions that comments with special characters will be ignored. I am posting more as documentation rather than a question for the field. I have a customization that takes task comments and copied them to a discussion forum so it must be able to handle anything the user can submit. Looking at my logs, I think it does not like & at least but need to get a complete list.
Caused by: org.xml.sax.SAXParseException; lineNumber: 1; columnNumber: 68; The entity name must immediately follow the '&' in the entity reference.
method that threw error was
at com.ptc.core.richtext.HTMLText.setFormattedText(HTMLText.java:369)
https://www.ptc.com/en/support/article/CS293387?source=search
Last one found for context when descriptions were converted.
