I have a bed that has not been crafted for more than 2 seasons now.

The bed shows as 4 of 4 oaken planks allocated.  

I don't have any oak planks left, they were used for something else.

What I do have is more than 30 birch planks.  

It appears the game doesn't register that I have a different type of resource available and change. 

Is this a Alpha only issue because we are going to be picking resource type in the future?  Or an actual problem?

If its 4 of 4 allocated they should exist somewhere, maybe they're quite far away which is why its taking a long time to be built if theres lots of other work to do thats closer? If it was less than 4 allocated for a long time and you'd run out, it'd be nice if it eventually reallocated the resource requirements, which is a feature request somewhere on the backlog.