Cannot open "symbol levels" on macOS

[lagniappist]

What is the bug or the crash?

The "Advanced" pulldown on the Symbology tab seems not to be active in a standard vector layer (SHP, classified with about two dozen features) in 3.20 and 3.22. Same functionality works in 3.16. Have reverted to 3.16 but can replicate the behavior between the two versions.

Steps to reproduce the issue

1. Load test QGZ file (or any vector shapefile with overlapping features).
2. Open Properties/Symbology.
3. Classify shapes using "Categorized" to create unique symbols/legends per shape. (The exact classification doesn't seem to matter BUT for some reason 3.20/3.22 WILL let you select "Symbol Levels" with "Single Symbol," which doesn't make sense, since a single symbol can't be layered.)
4. Select Advanced dropdown on lower right. Try and select "Symbol Levels." 3.16 will allow selection and will open dialog. 3.20/3.22 will not.

Visually:

3.16, with "Symbol Levels" highlighted in the Advanced pulldown (lower right):

Symbol Levels dialog as activated in 3.16:

3.20 with "Symbol Levels" unable to highlight/select in mouseover, in the same place:

Can get copies of the source files here (may have to fix the data source but it's in the same folder).

Versions

QGIS version	3.16.14-Hannover	QGIS code revision	4279198632
Compiled against Qt	5.14.2	Running against Qt	5.14.2
Compiled against GDAL/OGR	3.2.1	Running against GDAL/OGR	3.2.1
Compiled against GEOS	3.9.1-CAPI-1.14.2	Running against GEOS	3.9.1-CAPI-1.14.2
Compiled against SQLite	3.31.1	Running against SQLite	3.31.1
PostgreSQL Client Version	12.3	SpatiaLite Version	4.3.0a
QWT Version	6.1.4	QScintilla2 Version	2.11.4
Compiled against PROJ	6.3.2	Running against PROJ	Rel. 6.3.2, May 1st, 2020
OS Version	macOS 11.1
Active python plugins	joinmultiplelines; cadastre; latlontools; mmqgis; processing; db_manager; MetaSearch

QGIS version	3.20.2-Odense	QGIS code revision	9f59a15664
Qt version	5.15.2
Python version	3.8.7
GDAL/OGR version	3.2.3
PROJ version	6.3.2
EPSG Registry database version	v9.8.6 (2020-01-22)
GEOS version	3.9.1-CAPI-1.14.2
SQLite version	3.31.1
PDAL version	2.2.0
PostgreSQL client version	12.3
SpatiaLite version	4.3.0a
QWT version	6.1.4
QScintilla2 version	2.11.4
OS version	macOS 11.1
Active Python plugins	joinmultiplelinescadastrelatlontoolsmmqgisprocessingdb_managerMetaSearch

Supported QGIS version

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

New profile

• [X] I tried with a new QGIS profile

Additional context

No response

[gioman]

@lagniappist confirmed on macOS but not on Windows and Linux.

[gioman]

3. WILL let you select "Symbol Levels" with "Single Symbol," which doesn't make sense, since a single symbol can't be layered

@lagniappist sure it does makes sense:

single symbol, no symbol levels

single symbol. with symbol levels

[nyalldawson]

Does it work through the style dock?

[lagniappist]

Does it work through the style dock?

indeed it does! the behavior only seems to happen when layer properties are opened in a dialog window.

[NoahPollock]

I was having this issue as well but discovered I could navigate and select the symbol levels option by using the arrows on the keyboard.

[ConorMatthews]

Also having this issue and can still use the option by navigating with keyboard arrows