If i am holding the Little bag and i break some tiles with the little hammer it does not give me any tiles into my little bag nor does it give me any full blocks back into my inventory.

Can you test if this still occurs in the newest vesion:
https://cdn.discordapp.com/attachments/326729168266199040/748915793831657502/CreativeCore_v1.10.18_mc1.12.2.jar
https://cdn.discordapp.com/attachments/326729168266199040/748915823812280422/LittleTiles_v1.5.0-pre199_41_mc1.12.2.jar

If yes, make sure to post some screenshot (that makes it easier for me to follow).

I can't reproduce this issue in the newest version. I will close it for now. If it still happens for you (with the newest release on curseforge) make sure to contact me here again.