Hi StorageDrawer devs,

FIrst off, thanks for all your hard work and effort making your amazing mod. I've been using it for years and the experience is nothing short of awesome.

Anyway, I'm playing:
FTB Revelation (MC 1.12.2, Forge 14.23.5.2846) SINGLE PLAYER
Storage Drawers 1.12.2-5.4.2
Refined Storage 1.6.15
RebornStorage 3.3.4.1
Refined Storage Addons 0.4.4

I submitted my experience with this bug also to the RefinedStorage repo because I think the issue is more likely on their end but here as well in case you may have better insight.

On single player world load, my Refined Storage setup which uses an External Storage component connected to your Drawer Controller to access my storage does not see items that are contained on world load. The drawers are found but their contents are not, in using their Grids to see inventory, not until the connection is rechecked by way of a cable break or block update. Items that my mob farm feeds into the drawers do actually show up after world start but the items that were in the drawers at world load are not visible until the inventory is re-checked like in my half-solution above.

In playing with the issue by reorienting the drawer controller, or placing it in different locations, or having the external storage connect to different faces, nothing has solved the issue yet. I isolated my refined storage to a RS Controller, Grid, and External Storage and the issue still happens. The drawers block as well as my RS system are all contained within one chunkloaded chunk. I've tried substituting Phantomfaces proxying the Drawer Controller connected to the Ext Storage instead, still fails.

I hope any of this helps. Let me know if there's anything I can do to help fig this out.