Thanks for the reply Shwu-jing. The survey was published using version 3.7. I have 2 maps as linked content; the stakeholder feature service, and I added an additional web map as a reference. The survey was built from scratch (not from an existing feature service) but was a revision of an older survey. I did append the records from the old survey to the new (minus photos).
This survey has become pretty high profile in our organization, has dozens of users across multiple divisions/departments, contains hundreds of photos (which in my experience are very difficult to append) and has an associated dashboard - and other than the issue I'm asking about - is fully functional. Rebuilding/republishing is probably not an option for us as this is really just an annoyance more than anything. When I have time I may test the workaround.
I'd still be interested in a solution that doesn't require a rebuild though
Thanks again!