[Processing] Executing the "Reproject layer" alg, warning messages are displayed: "WARNING Cannot open +proj=pipeline +step ..."

[agiudiceandrea]

What is the bug or the crash?

Executing the "Reproject layer" (native:reprojectlayer) processing algorithm the following warning messages are displayed in the OGR tab of the Log Messages panel:

WARNING    Cannot open +proj=pipeline +step +proj=unitconvert +xy_in=deg +xy_out=rad +step +proj=utm +zone=32 +ellps=GRS80 ().()
WARNING    Cannot open +proj=pipeline +step +proj=unitconvert +xy_in=deg +xy_out=rad +step +proj=utm +zone=32 +ellps=GRS80 ().()

The issue occurs using QGIS 3.34.8, 3.38.0, 3.39.0-Master 5af079ea9f on Windows 10.

Steps to reproduce the issue

1. just execute the "Reproject layer" algorithm to reproject a layer

Versions

QGIS version
3.38.0-Grenoble
QGIS code revision
37aa618
Qt version
5.15.13
Python version
3.12.4
GDAL/OGR version
3.9.0
PROJ version
9.4.0
EPSG Registry database version
v11.004 (2024-02-24)
GEOS version
3.12.2-CAPI-1.18.2
SQLite version
3.45.1
PDAL version
2.6.3
PostgreSQL client version
16.2
SpatiaLite version
5.1.0
QWT version
6.2.0
QScintilla2 version
2.14.1
OS version
Windows 10 Version 1903

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

@nyalldawson, it looks like this issue with the QgsProcessingParameterCoordinateOperation parameter is similar to other issues with processing parameters #57758 and #57494 and others already fixed by you.