A family of Microsoft word processing software products for creating web, email, and print documents.
No reflection on you... It's just that the way Microsoft is doing things updated can be any of a dozen possible permutations, each with their own considerations. It can be very deceiving.
Please provide the specific Version Numbers of both macOS & Office in order to confirm.
Have you tried restarting the Mac?
Are you using any 3rd party add-ins or utilities which interact with Word?
Running Office 16.86 on Ventura 913.6.7) I am not able to reproduce what you're reporting. Neither have I seen any similar postings in any of the Mac Word Communities. The only similar behavior is when the Markup Options for Balloons is set to Show All Revisions Inline. With that setting the Reviewing Pane opens when inserting a new Comment but not when clicking an existing Comment in the document. In that case the Display for Review setting doesn't change to Simple Markup either.