• Minecraft version: 1.20.1
• Mod loader version: Forge 47.3.12
• ToLaserBlade version: 7.0.1.1

Steps to Reproduce:

1. Laser Blade Blueprint + Laser Blade + Block of Diamond (on the Smithing Table)

Description of bug:

The Attack Damage Upgrade recipe doesn't work.
Resources are spent, but the damage is not increased.

Thank you for the detailed report.
The laser blade's attack damage and speed are modified using attribute modifiers, so using mods that change them may overwrite the upgraded values. I believe the same thing occurred in the Golden Age Combat mod.

I will put a note on the mod distribution page about compatibility with the Golden Age Combat mod.
Thank you for your valuable information.

Thank you for your report.
I tested with the same configuration, however could not reproduce this problem.
Please let me know if you have any other mods you used at the time to reproduce the problem.

Thank you for pointing out the incompatibility of the mods.
It turned out that there is an incompatibility of this mod with the Golden Age Combat mod.
With the default settings, the Golden Age Combat mod changes the attack damage values for each weapon:
Attack damage values for every weapon and tool are rebalanced to accomodate the removed cooldown, mostly resembling Minecraft 1.8's values
The problem is solved by disabling the setting:
#Revert weapon and tool attack damage to legacy values.
legacy_attack_damage_values = false
If this setting is enabled, the damage of the base laser sword increases by +1, and does not increase the damage of the sword on the Smithing Table.
I'm using the Golden Age Combat mod to disable the attack cooldown.

I think it will be useful for you to point this out in the description of your mod for other users.

Thanks