point cloud laz file loading error in QGIS versions 3.40 and above

[kmirrorall]

What is the bug or the crash?

In version 3.34.15, everything worked correctly. In versions 3.40.LTR and 3.42.1 (I dont check 3.36), attempting to load a point cloud file (.laz) - which previously worked without issues - causes an error:

Instead of processing the .laz file into a .copc.laz file, the program only creates an empty directory. If the .copc file was created previously (in an earlier version of the program) and is located next to the .laz file, then everything loads without any issues.
I know that when the version changed from 3.34 to 3.36, there was a version change of the Untwine tool. However, replacing that file in version 3.40 with the file from version 3.34 also causes this bug.

I tested this bug on a production computer (WIN 10 Pro 22H2) as well as on a virtual machine (clean WIN10Pro 1909)

Steps to reproduce the issue

1. you can download example cloud file from polish cadaster: https://opendata.geoportal.gov.pl/NumDaneWys/DanePomiaroweLAZ/79898/79898_1514633_M-34-50-D-d-1-2-1-3.laz
2. drag file to QGIS
3. get error

Versions

Wersja QGIS	3.40.5-Bratislava
Rewizja QGIS	8d6d1b5448
Biblioteki
Wersja Qt	5.15.13
Wersja Pythona	3.12.9
GDAL version	3.10.2
Wersja PROJ	9.6.0
Wersja bazy danych Rejestru EPSG	v12.004 (2025-03-02)
Wersja GEOS	3.13.1-CAPI-1.19.2
Wersja SQLite	3.46.1
Wersja PDAL	2.8.3
Wersja klienta PostgreSQL	unknown
Wersja SpatiaLite	5.1.0
Wersja QWT	6.3.0
Wersja QScintilla2	2.14.1
Wersja systemu operacyjnego	Windows 10 Version 2009

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

[uclaros]

Seems to work ok on master. QGIS 3.42 uses untwine 1.5.0 though, while 3.40 is on 1.4.0

[kmirrorall]

Is the master version like a beta version? How do I use it?
I just installed the 'OSGeo4W Network Installer' version, and in each of the versions 3.40.6 or 3.42.2, I get the same error: Untwine error: Untwine exited with code: 3221225477

[uclaros]

Master is the development version, 3.43, which will eventually be released as 3.44 and is available through the nightly builds. However, regarding untwine, it should be the same as 3.42.

Can you please try moving the laz file to a drive's root folder (eg. c:\) and see if it still fails?

[kmirrorall]

So I tried (I also changed the file name to something simple: aaa.laz). It still doesn't work. It doesn't seem to be a problem related to the path or the file name.
The problem probably appeared (for me) as early as version 3.36. But since I only use LTR, I only noticed it in 3.40.
Is there a possibility in a newer version of QGIS to use an older version of untwine and a configuration file (if untwine has one)?
For me, it's a broader problem because in the newer version, SAGA also isn't working correctly for me.

[planningblaster]

Ran into this myself on 3.42.3.
File was extracted from a NOAA zip to a folder on a shared could drive. Was able to resolve the loading error by moving the file to my desktop (thus removing spaces and special characters from folder names in the file path).

[kewgis]

I had an untwine error before and it was because there wasn't enough space on the drive to make the .copc.laz file.

[baswein]

I was having a problem last week when loading laz files that were stored in a synced google drive folder. It would get most of the way through the conversion to .copc.laz and then fail on indexing. This PR seems to have fixed it for me. #62492 it may be that it also fixes your problem. I think it will fix @planningblaster issue as my work around last week was to put it in a non google drive folder (the desktop).