@ Mark, have you closed the project and reopened it? Does the marker ID stay related to the Zone? Is it a teamwork project?
I just did as you did, moved my zone boundary then moved it back, sent changes and closed the project, then reopened it. I still get '#Zone Name #Zone Number' for the marker ID.
Casey Grimley
AC24
iMac Pro (2017) - macOS 10.14.6- 3.2GHz Intel Xeon W - 32GB RAM - Radeon Pro Vega 56 8GB