The bug:

Resin clumps do not drop when one of their face's supporting blocks is broken/moved and there are multiple resin clumps in a single block. Therefore, that face of the resin clump is gone and cannot be retrieved, even if gamerule doTileDrops is set to true.

Steps to Reproduce:

1. Build this structure:
2. Break one of the dirt blocks that the resin clump with multiple faces lies on. Pick a face.
3. That face is destroyed and won't drop.

Expected Results:

Resin clumps will drop in multi-faced resin clumps when one of their face's supporting blocks is broken/moved and there are multiple resin clumps in a single block.

Observed Results:

Resin clumps will not drop in multi-faced resin clumps when one of their face's supporting blocks is broken/moved and there are multiple resin clumps in a single block.

Notes:

This bug will not occur on single-faced resin clumps, they will drop normally in this case.