Decorations: expressions in Title Label

[pigreco]

What is the bug or the crash?

In QGIS version 3.22.10 the aggregation expressions in Title Label decoration worked, now in the recent versions 3.34, 3.40 and master they do not work anymore.

here is a demo of QGIS 3.22:
https://x.com/totofiandaca/status/1558714134463762432

the expression used is:

aggregate (
layer:= 'LayerName',
aggregate:= 'count',
expression:= @id,
filter:= intersects (@map_extent, @geometry))

In current versions of QGIS, the expression used in the Title Label always returns 0

Steps to reproduce the issue

1. start QGIS;
2. load the point or polygon layer;
3. From the View | Decorations | Title Label menu, insert the expression using the 'Insert or edit an expression' button

Versions

Versione di QGIS	3.40.3-Bratislava
Revisione codice QGIS	2a274ab7
Librerie
Versione Qt	5.15.13
Versione Python	3.12.8
Versione GDAL/OGR	3.10.1
Versione PROJ	9.5.1
Versione database del Registro EPSG	v11.022 (2024-11-05)
Versione GEOS	3.13.0-CAPI-1.19.0
Versione SQLite	3.46.1
Versione PDAL	2.8.3
Versione client PostgreSQL	unknown
Versione SpatiaLite	5.1.0
Versione QWT	6.3.0
Versione QScintilla2	2.14.1
Versione SO	Windows 11 Version 2009
Plugins Python attivi
DataPlotly	4.0.1
kmltools	3.1.29
nominatim_locator_filter	0.2.4
Qgis2threejs	2.7.1
QGIS_FMV	1.15
quick_map_services	0.19.33
db_manager	0.1.20
grassprovider	2.12.99
processing	2.12.99
MetaSearch	0.3.6

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

[agiudiceandrea]

@pigreco, I cannot replicate the issue on Windows 10 running QGIS 3.40.3 from OSGeo4W:

Video_2025-01-30_090706.mp4

[pigreco]

It doesn't always work, with this expression it always returns 0

aggregate(
layer:='World Map',
aggregate:='sum',
expression:= "fid" ,
filter:=is_selected())

[agiudiceandrea]

Does the expression mentioned in the issue description works correctly? Does the expression mentioned in the latest comment worked with QGIS 3.22 in the Title Label decoration?
Does this expression works:

aggregate(
layer:='World Map',
aggregate:='sum',
expression:= "fid" ,
filter:= is_selected( 'World Map', @feature ))

[pigreco]

@agiudiceandrea

Does this expression works:

aggregate(
layer:='World Map',
aggregate:='sum',
expression:= "fid" ,
filter:= is_selected( 'World Map', @feature ))

Yes, this works!
Thanks a lot