After launching a rocket and in the planet selector screen when you select a planet it is stuck on the loading screen. The game crashed once because of this and because I have vanilla fix it told me that betterportals created a problem. Is there a workaround to make it so it doesn't do anything with the galacticraft mod?

Known issue, there's no workaround, the way galacticraft teleports player to different dimensions is fundamentally incompatible with BP: micdoodle8/Galacticraft#3835