Gathering Secret Inconsistent/Non-functional

[Kuma]

Description
==========
Secret Knowledge of Gathering doesn't seem to work for everything that you'd expect it to.

Steps to reproduce
----------------------------
Mine Things With Appropriate Tool

Expected result
-----------------------
The following feedback:

That is to say, 25% or 10% (as appropriate) more resources than you ordinarily would have gotten. In this instance, I mined 8 Iron Ore, and got 2 bonus.

Actual result
-------------------
Not all things function as expected, and not everything provides me any feedback beyond using the correct tool. Here are my findings, will update as I continue to test.

WORKED
Iron
Copper
King's Crown
Yarrow
Sand
Mandrake

DID NOT WORK (i.e: did not provide me with the Secret Gathering feedback text, and no bonus resources)
Coal
Greenstone
Topaz
Larvae Sack (UD Berry Bush)
Fire Opal
Fire Agate
Salt
Obsidian

[The GrumpyCat]

So far Salt and Coal work just fine for me (playing a loremaster with this) - not every time but some times. I'll monitor the other ones you mentioned and see if they work or not for me.

[Kuma]

Bump with extra resources edited in to original post.

[Kuma]

https://cdn.discordapp.com/attachments/ ... adc23b.png

Greenstone deposit, received debug message but not feat message, and no extra resources.

Was using a Gem Mining Hammer.