I pretty much only use copper modules or direct press now. After doing the research into the properties of brass I won't ever use an aixiz module again.
Most relevant here is the poor tolerances in the majority of Aixiz modules. This is what makes it so difficult for Flaminpyro and others to machine tools to work with them. Since that is a copper module, it probably had a different dimension specified for the hole for the diode can. Same problem I ran into with the brass heatsinks in some China made lasers and hosts that I bought.