Using flint&steel to burn items in rain makes them invisible

Summary:
Using flint and steel on items in rain makes the item look like they burned but, actually makes them invisible.

Steps to Reproduce:

1. Set the weather to rain
2. Throw items on the ground
3. Use a flint and steel repeatedly on the block the items are on

Observed Results:
The items become invisible and can be picked up.

Expected Results:
The items should either not become invisible or they should be destroyed.