Updating the strapi version from 4.15.5 to 4.20.1,
The single collection type shows blank page on opening its content manager tab. Even the logs are clean without errors in the terminal, with last API call ( GET ) on the single-type collection with 200 response. PFA the terminal logs as well:
Node version: 18.17.1
For the admin panel customization,
React version: 18.0.0
Similar thing happens to me. Single types sometimes get broken when i give them a relation (onetomany), when i remove it it’s fine. If i give that relation to a collection type everything is fine.
Unlike you i get an error in console (time format invalid) i havent used any datetime elements/types also i havent touched anything in my api controllers/services.
To me similar happened in 4.24 and 4.25 too.
But all the requests under /content-manager/single-types/api::* were giving 404 not 200.
I have added a workaround here:
Basically need to change single type route handler to collection type handler:
/node_modules/@strapi/plugin-content-manager/dist/server/index.js line around 160:
method: "GET",
path: "/single-types/:model",
handler: "single-types.find",
Change handler to “collection-types.find” after which they will become visible and you will need to fill at least one field with data so they will remain visible with “single-types.find” handler as well.