The 9/30/19 Patch featured an undocumented change. Depending on how you use konsumables, it's either no big deal, or very, very bad.
They've introduced a global cool down that triggers whenever you use a single one of your konsumables...which basically means all three that you have equipped become unusable when you use just one. This now makes it impossible to chain multiple offensive konsumables into a kombo, and basically makes it pointless to carry more than one type of offensive konsumable at a time.
This was NOT in the patch notes, which makes me wonder if this was an unintended change...because that's how konsumables worked at launch.