Following the debit of the majority of my bills on Tuesday, I categorised these transactions to “Bills & Services”. A day later, I noticed that half of these transactions had recategorised themselves to “General”. I’ve since categorised them again… and, thankfully, this seems to have stuck! Touch wood.
Today, an in-store transaction is now appearing in “General” that I most definitely categorised as “Home” yesterday.
This seems like a bug. Android 8.0.0.