Intersection of points and polygons with one field doesn't work well if result saved to GeoPackage

[phidrho]

Describe the bug
When doing an intersection between two vector layers (I tried with point and polygon layers, it is possible that it doesn't work well with other combinations of vector layers), if only one field was chosen to keep from source layer, after intersection algorithm and file type for result chosen to be geopackage layer (either inside existing geopackage db, or new one) - resulting layer doesn't contain data from chosen input field.

How to Reproduce
Geopackage file for testing:
qgis_bug.zip

see video:
YouTube - QGIS GPKG intersecton bug

QGIS and OS versions
Windows 10 Pro, version 1903

QGIS version
3.10.0-A Coruña
QGIS code revision
6ffa89e
Compiled against Qt
5.11.2
Running against Qt
5.11.2
Compiled against GDAL/OGR
3.0.2
Running against GDAL/OGR
3.0.2
Compiled against GEOS
3.8.0-CAPI-1.13.1
Running against GEOS
3.8.0-CAPI-1.13.1
Compiled against SQLite
3.29.0
Running against SQLite
3.29.0
PostgreSQL Client Version
11.5
SpatiaLite Version
4.3.0
QWT Version
6.1.3
QScintilla2 Version
2.10.8
Compiled against PROJ
6.2.1
Running against PROJ
Rel. 6.2.1, November 1st, 2019
OS Version
Windows 10 (10.0)
Active python plugins
gml_application_schema_toolbox;
LAStools;
mmqgis;
db_manager;
MetaSearch;
processing

Additional context

[gioman]

Confirmed also on 3.4. Works as expected when outputting to temp layer and shapefile. Not when saving to GPKG to a specific file/location.

[elpaso]

The bug is here: https://github.com/qgis/QGIS/blame/74a6871d9e515b2118ee7e43f078c16ed3521745/src/core/qgsvectorlayerexporter.cpp#L124

[elpaso]

@gioman in 3.4 too? The code that introduced the bug looks landed in 3.6 (but I might be wrong)

[gioman]

@gioman in 3.4 too?

@elpaso yes I tested on the latest 3.4