Unfortunately this is still an issue and I just called support and had case number 15 19195832 opened for it. I had only seen the thread at https://turbotax.community.intuit.ca/community/troubleshooting/discussion/form-form-on428-part-c-lin... before calling which didn't have a follow-up.
I think the root cause is that the line order changed since 2021 but Turbo Tax wasn't updated to reflect that. You can see the 2021 form online at https://www.canada.ca/content/dam/cra-arc/formspubs/pbg/5006-c/5006-c-21e.pdf
