i just checked last time i was playing was after the new update, but to be honest it may be that i did not try crafting while playing online then (i think i just tried out the new tutorial). i was away for the weekend, so today i played again but without internet connection and this happened to me, so tbh i think my assumption this has something to do with offline use may be wrong, especially because many people are experiencing this.

If this helps, this is a new issue. in previous beta builds, crafting worked fine, but they now added the option to stack items instead of combining them, for example, so they made changes to crafting that may now cause this.