Upgrade the firmware of your snapmaker to the latest version. Luban 4.9.0 changed the way the laser works, and requires at minimum firmware version 1.17.17.
I wish people would use the forum search more… This topic/solution is one of those that I’ve seen several times, also the DX replacement kit discussion is repeating itself all the time…
Facebook group has posts about it every other day. Ever since the firmware release. Very few people use search unfortunately.
I hope dev team learned the lesson…