Available WMS layers are not displayed in QGIS Browser

[pathmapper]

Describe the bug Available WMS layers are not displayed in the QGIS Browser.

How to Reproduce After adding a WMS with the following URL to the browser with QGIS 3.12.0 the available WMS layers are not displayed in the browser (there is only 1 layer displayed but there are more): https://www.wms.nrw.de/geobasis/wms_nw_dop

QGIS and OS versions

QGIS version	3.12.0-București	QGIS code revision	409bcf8eaa
Compiled against Qt	5.11.3	Running against Qt	5.11.3
Compiled against GDAL/OGR	2.4.0	Running against GDAL/OGR	2.4.0
Compiled against GEOS	3.7.1-CAPI-1.11.1	Running against GEOS	3.7.1-CAPI-1.11.1 27a5e771
Compiled against SQLite	3.27.2	Running against SQLite	3.27.2
PostgreSQL Client Version	11.6 (Debian 11.6-0+deb10u1)	SpatiaLite Version	4.3.0a
QWT Version	6.1.4	QScintilla2 Version	2.10.4
Compiled against PROJ	5.2.0	Running against PROJ	Rel. 5.2.0, September 15th, 2018
OS Version	Debian GNU/Linux 10 (buster)
Active python plugins	ClipMultipleLayers; quick_map_services; scriptrunner3; LAStools; canvas_clipper; savedialog; loadthemall; kmltools; MapsPrinter; mmqgis; pluginbuilder3; vector_tiles_reader; layerGroupFilter; plugin_reloader; realcentroid; mask; MetaSearch; db_manager; processing

Additional context

• With QGIS 3.10.1 the WMS layers are displayed.

• With QGIS 3.12.0 it is possible to add the WMS layers via the "Data Source Manager":

• https://github.com/qgis/QGIS/issues/34692 could be related.

[gioman]

Confirmed regression.

[Samweli]

Confirmed on master, working on a fix!

[pathmapper]

This is fixed in 3.12.1, thanks!