When a piston pushes multiple gravity affected blocks (ei gravel), they will sometimes be destroyed. Reproduce the issue by stacking 4+ gravel on a piston and then quickly extend/retract using a lever. One piece of gravel at a time will be dropped, prior to 1.18.1 this was not the case.
Environment
Windows 10 21H2
Thank you for your report!
We're tracking this issue as MC-26356, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as Won't Fix, which means this is considered a bug but won't be fixed. The description of that ticket or the comments might explain the rationale. Please do not leave a comment on the linked ticket.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
Quick Links:
📓 Bug Tracker Guidelines – 💬 Community Support – 📧 Mojang Support
📓 Project Summary – ✍️ Feedback and Suggestions – 📖 Game Wiki