1/3 caster subclasses can't learn spells

When I level to 3 and select a subclass, like arcane trickster, I can’t prepare spells even though I show dots for spell

l slots available, and even though my known shows known spots available.

Because the workaround is to switch the spell caster type from “third” to “half” I assume the bug is in the spell slots per spell level. The cantrip and spells known will be correct.

I tried exporting the campaign class and re-importing it, and I also tried importing “working” classes from other world, but had the same problem each time. I’ve tried adding spells to the subclass in campaign world classes. I’ve tried adding spells to the subclass and i’ve tried adding spells in my spellbook. It doesn’t matter which method is used, the spells will be greyed out unless I switch from spellcaster type third to spellcaster type half.

At level 3 the game tells me I only have access to level 0 spells. We cannot directly edit spells slots per spell level. We can only edit directly cantrips known and spells known. These were correct in all of the classes I tried switching to and the subclasses.

I had the same issue on the other campaign I tried (Ashen Lands) where I tried downloading other people’s classes and building the class from zero. When I built the class from zero I added each spell individually, almost 200 of them. So I think the problem is that “Spellcaster type third” has some kind of bug under spell slots.

Again, a workaround is setting spellcaster type to half.