[mvt] Valid style could not be opened

[pathmapper]

What is the bug or the crash?

Layer is not valid: The layer is not a valid layer and can not be added to the map

Steps to reproduce the issue

Add a vector tiles connection with the following style and try to open it:

https://gist.githubusercontent.com/pathmapper/fc570044a2231d9cf5d3c5294c532860/raw/ddb4b93a0fd96369d8ebce23efe39947ada96ccf/style.json

{
  "version": 8,
  "name": "bg",
  "sources": {},
  "layers": [
    {
      "id": "bg",
      "type": "background",
      "layout": {"visibility": "none"},
      "paint": {"background-color": "red"}
    }
  ]
}

Versions

QGIS version | 3.39.0-Master
QGIS code revision | 22036c1
Qt version | 5.15.3
Python version | 3.10.12
GDAL/OGR version | 3.9.0dev-18f9ed2b7c
PROJ version | 8.2.1
EPSG Registry database version | v10.041 (2021-12-03)
GEOS version | 3.10.2-CAPI-1.16.0
SQLite version | 3.37.2
PDAL version | 2.3.0
PostgreSQL client version | 14.13 (Ubuntu 14.13-0ubuntu0.22.04.1)
SpatiaLite version | 5.0.1
QWT version | 6.1.4
QScintilla2 version | 2.11.6
OS version | Ubuntu 22.04.4 LTS

Supported QGIS version

• I'm running a supported QGIS version according to the roadmap.

New profile

• I tried with a new QGIS profile

Additional context

No response

[ptitjano]

This connection cannot be opened because the sources part of the style is empty.