I did my best to search in the forum and to do some trials in the software (I use the version before 1.5) before asking here.
I did a material test wisard and I have saved the GCODE. I have then created a new project and imported the GCODE. I see that inside it the information about the speed and power is retained. However it seems that during the import Lightburn ignores this. Is this a feature or a bug?
I believe this is working as intended. LightBurn makes no attempt at trying to recreate layer data from g-code. G-code itself is not inherently structured that way and trying to derive that would be more interpretation than science. This is especially true if you consider all the additional parameters that can be defined in Layers that would be impossible to back into.
Well, while I agree with you that there would be very few use cases for this, I was looking for a way to create the material test (from the wizard) and then modify it a bit manually.
Now the material test wizard is not very user friendly for novice users like me.
In what way are you trying to modify it? There may be an easy resolution.
But if for some reason the builtin material test generator is not working for you then I’d suggest creating from scratch or using an external generator like the ones found here: Lightburn PowerScale Generator - O2 Creative