killing someone using the command /kill while they have a "checkpoint" at the respawn anchor will not spawn them at it and the anchor will stay with the same charges
Comments 4
I made a lan server with a friend and showed them the respawn anchor, I told them to right click it with glowstone and then killed them with the /kill command to show them how it worked but they respawned in the overworld
Right clicking with glowstone will not set your spawn unless the anchor is fully charged. If it's not fully charged, you have to right click with another item or an empty hand to set your spawn.
I've been unable to replicate this bug. Could you give a more specific example of the steps you did?