Tooltip hook stopped working in latest patch?

[Yocote]

Is anyone aware of any changes in how tooltip hooking works in yesterday's DragonFlight patch (2022-10-04, patch 45969)? One of my addons that adds a few lines to item tooltips has unexpecetdly stopped working (it worked in earlier dragonflight beta patches). Has there been a change? Or alternatively, can anyone show a minimalistic example of addon code that adds a line to an item tooltip?