Modpack version
1.63

Can the issue be reproduced?
Yes

Issue
The "merge to nearby inventories" button no longer works on iron chests in quark. Easy fix though, just add the relevant entry "ironchest:iron_chest" to the configuration file under the " # Blocks with inventories which do not explicitly accept dropoffs, but should be treated as though they do." heading. I just did it with forge's ingame mod configuration menu and fixed the problem straightaway (Quark->Management->Chest Buttons and add an entry to "Dropoff Enabled Blocks").

Someone raised exactly this issue on the quark github yesterday, which is where I discovered the fix: VazkiiMods/Quark#1230

Thanks for the report and fix :D

Quark seems to have released :)

No?

Wait, what are we waiting for exactly with this issue? For the Quark team to implement built-in Iron Chest support for the inventory button? If so, wouldn't a config change suffice in the meantime? Or do you prefer not changing the configs?

We're waiting for them to push a new build to fix two new crash bugs introduced in the last update.

Ah, that explains; sorry for my derp :)

No worries :)