I’ve actually emailed support for clarification on whether or not this is intended. I’ve yet to receive an answer. It’s been brought up repeatedly, both in these forums and on Reddit and the Steam community, with plenty of unfriendly and unhelpful discussion in several cases. It seems like it would be an easy win to simply state the intended behavior to end the pointless arguments, confusion and repeated bug reports. If it’s intended, players can use it to develop characters without worry. If it’s not intended, players can plan around the fact that it will eventually be fixed.
As an aside, I still haven’t seen definitive commentary on Warlock spell slots not being usable for multiclass functions before normal spell slots are first expended (e.g. sorcerer points).This is another point of confusion among members of the community that could be clarified by support even if a fix isn’t necessarily imminent.
The lack of communication is a shame considering Warlock is such an interesting consideration for multiclass.