Put mutation (having TTL set) added via co-processor is retrieved even after TTL expires

Steps to reproduce

1. Create a region co-processor and override preBatchMutate such that it creates a put corresponding to a user put having same timestamp and TTL as the user put.
2. Create a table and add a row having TTL set to 3000 ms.
3. Wait for > 3000 ms.
4. Scan the table.

Expected Result
No rows should be retrieved in step 4

Actual Result
User row is not retreived, while put created via co-processor is still retrieved.

Analysis/Issue
Unlike user mutations, the mutations added by coprocessor do not have tags corresponding to TTL, hence they are retrieved in scan even after TTL expires.