I produced a model after aligning multiple laser scans to supliment the photogrammetry. I selected the resulting model (with an [R] alignment designation) and decimated it to create a 2nd smaller model. The resulting decimated model is tilted at an angle and not aligned to any other model or point cloud in the project (even in other chunks). This of course makes it impossible to build new textures from the images.
Metashape Professional v. 2.1.0 build 17262 (64 bit)
Windows 10 Pro v. 22H2 OS Build 19045.3693
It happens to me also, using the same version (2.1.0 17262), not always but in most cases 8 out of 10 times. There is a similar bug in this version, sometimes when you export the model it is moved by a few meters from its original position and when you import it back it's impossible to re-texture.
I hope they can fix this soon in the next update as I'm stuck with this version now, I'm unable to open my saved projects with an older version of metashape and continue my work.