Data defined override for label rotation does not respect defined data

[phidrho]

What is the bug or the crash?

We have an option to use data defined values for label rotation under Layer Properties > Labels > Placement > Data defined.

Unfortunately if we set this override to active and define our own angles, text rotations don't follow defined angles, but it behaves semi automatic - rotating text to be most readable (upright). Although this is a nice feature to have while working on a monitor, for print preparation and for data exchange with other formats (import/export) we need to be able to set exact angles.

Rotation is interpreted as clockwise angle with 0° pointed to East.

Example 1 - OK - Offset from Point - placement set to upper right quadrant, without setting Rotation override

Example 2 - OK - Offset from Point - placement set to upper right quadrant, with Rotation override set to 45°

Example 3 - OK - Offset from Point - placement set to upper right quadrant, with Rotation override set to 89°

Example 4 - BUG - Offset from Point - placement set to upper right quadrant, with Rotation override set to 90°

Example 5 - BUG - Offset from Point - placement set to upper right quadrant, with Rotation override set to 110°

Example 6 - BUG - Offset from Point - placement set to upper right quadrant, with Rotation override set to -270°

Behavior is the same with Cartographic Mode and Around Point Mode.

I consider this as a bug report rather than Feature request, because with current implementation we have no option to rotate text in desired direction, and by enabling "override" option this is what should be possible, to override automatic placement and rotation of labels.

Steps to reproduce the issue

Create a point with label. Set Data defined override for Rotation to =>90°.

Versions

QGIS version	3.40.2-Bratislava
QGIS code revision	14826ca1
Libraries
Qt version	5.15.13
Python version	3.12.8
GDAL/OGR version	3.9.3
PROJ version	9.5.0
EPSG Registry database version	v11.016 (2024-08-31)
GEOS version	3.13.0-CAPI-1.19.0
SQLite version	3.46.1
PDAL version	2.8.1
PostgreSQL client version	16.2
SpatiaLite version	5.1.0
QWT version	6.3.0
QScintilla2 version	2.14.1
OS version	Windows 11 Version 2009
Active Python plugins
db_manager	0.1.20
grassprovider	2.12.99
MetaSearch	0.3.6
processing	2.12.99

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