PSA, it looks like something on this broke recently. I’m now getting:
[Admin Notice] Theme ‘Created Topic Sort’ contains code which needs updating. (id:discourse.modify-class-model)
And this in my console logs:
DEPRECATION NOTICE: Using api.modifyClass on `model:topic` is deprecated. Use the `addModelField`, `addModelAccessor`/`addModelGetter`/`addModelSetter`, `addModelMethod`, `addModelSaveProperty` and `addModelCallback` APIs instead. [deprecated since Discourse 2026.8] [deprecation id: discourse.modify-class-model]