Just want to add to this - as of most recent updates and hotfixes --
Having pact magic spell slots and spellcasting spell slots of equal levels -- you cannot choose which slot you want to use to cast a Spell.
Ex: A Bard 1 / Warlock 1 fresh crashed from the nautiloid -- if I try to cast, say, Sleep learned from my Bard spell list, the game will not give me the option to cast it with a pact magic slot and forces me to use bard slots first.
I can only assume this will continue to prove itself true even as I gained more levels. Intended build for the character in question is Warlock 2 / Bard 10 - but with the current bug, any spell I want to cast at 1st-level will force itself to use my Bard spell slots before using Pact Magic slots.
Going to assume this is because Pact Magic slots are treated as "additional spell slots" without any actual distinction from normal spell slots (the warlock's "highest level only" casting is hardcoded onto the spells rather than the spell slots). So no matter the multiclass -- Sorlock, Bardlock, Wizlock, Cleric/lock, Druid/lock -- if you have any spellcasting slots they will remain bugged, for the foreseeable future, with your pact magic slots and cause problems.
Kind of saddening, honestly.
