on break of oak_log does work.

[HelParadox]

I was just trying to write a simple skript with this expression and it was give me an error.

I put in the code "on break of oak_log:"

It should have detected if the oak log was broken and run some other code

Server version: git-Paper-"b89788a" (MC: 1.16.5)
Skript Version: 2.5.3-MH

[MinecollYT]

Use on break of oak log:

[AyhamAl-Ali]

Can confirm on vanilla Skript 2.5.3 and MC 1.16.5

oak_log = Error
oak log = Working

EDIT:
Note sure if this is intended or not but in older released using underscores in aliases used to work

Not just oak_log other items as well, not sure if all

[TPGamesNL]

oak log is a normal item type, but oak_log is a block data, which cannot be used everywhere (e.g. oak_log with lore "abc" errors too).
You should stick to using the aliases instead of textual IDs for now, although having more support for block data is a suggestion.

[APickledWalrus]

I believed this was added in #4033 which has been merged (and is in beta builds). I am going to close this issue since it should have been resolved.