Greed and stupidity, it looks like. Possibly it's a New Coke gambit of some kind..?
They say sourcing/supply chain issues, but other brands say they haven't had any such problems.
The other brands sell theirs for a lot more than Twinings did.
If it's a New Coke thing, expect the original flavour to return but at 5 times the original price.
(
brb Monkhouse Stampede, Mon 1 May 2023, 16:27,
archived)
It's been banned in most of Europe
As it's feared that it may be carcinogenic, so good luck finding another brand
(
Smash Monkey 2 Prozac is apparently good for menopause, Mon 1 May 2023, 18:54,
archived)