Did you import WeCreat’s .lbdev device profile when you added the laser to LightBurn as instructed on their page? (I’m hoping you didn’t, because then we likely have the solution for your other post, too! 
)
Here’s a direct link to the one for the Vista: https://cdn.shopify.com/s/files/1/0734/9773/9561/files/WeCreat-Vista-V1.0.lbdev?v=1747720649
Download this file and drop it in the work area to add it.
It contains these Start and End Codes, which are needed for their implementation of the Gcode:
