[WFS] Layer is added incorrectly as mixed geometry collection

[pathmapper]

What is the bug or the crash?

Layer is added incorrectly as mixed geometry collection but there are only features with no geometry.

Result:

---

Expected:

Steps to reproduce the issue

1. Add the following WFS connection to QGIS browser: https://xplanung.freiburg.de/xplansyn-wfs/services/xplansynwfs
2. Add the feature type: xplan:BP_Bereich
3. See error: A mixed geometry collection layer is added, but there are only features with no geometries returned with the WFS response (xplansynwfs.zip)

Versions

QGIS version	3.27.0-Master	QGIS code revision	876188b
Qt version	5.12.8
Python version	3.8.10
GDAL/OGR version	3.0.4
PROJ version	6.3.1
EPSG Registry database version	v9.8.6 (2020-01-22)
Compiled against GEOS	3.8.0-CAPI-1.13.1	Running against GEOS	3.8.0-CAPI-1.13.1
SQLite version	3.31.1
PostgreSQL client version	12.11 (Ubuntu 12.11-0ubuntu0.20.04.1)
SpatiaLite version	4.3.0a
QWT version	6.1.4
QScintilla2 version	2.11.2
OS version	Ubuntu 20.04.4 LTS
Active Python plugins
sagaprovider	2.12.99
grassprovider	2.12.99
MetaSearch	0.3.6
processing	2.12.99
db_manager	0.1.20

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

Similar issue in #49328.

[gioman]

Maybe because it is advertised with having CRSs and an extent