Farmland and Pathways slide the player off them if they are placed without another block of any sort on each of the four cardinal sides. If there are blocks on the four cardinal sides, but not the diagonals, you will not slide off. Mobs are unaffected. Items are also unaffected.
Thank you for your report!
However, this issue is a duplicate of MC-166386.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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:
📓 Issue Guidelines – 💬 Community Support – 📧 Customer Support – 📖 Game Wiki