When you stand on farmland, soulsand and some other non full blocks. you automatically get pushed off. When on the edge of the block it pushes you off. It happens in creative and survival. It is happening on multiple peoples games on servers and in single player.
Related issues
Comments

Thank you for your report!
However, we are already tracking this issue, and this report is a Duplicate of MC-188987, which is a report that has not been resolved yet.
If you want, you can upvote the parent ticket, and enable watching to receive any updates about it - if you believe you have any information that may be important for this issue, please leave a comment on the parent. Please also use the search function in the future to prevent duplicate reports.
Quick Links:
📓 Issue Guidelines – 🛠 Community Support – 📧 Customer Support – ✍️ Feedback and Suggestions – 📖 Game Wiki
💬 Mojira Subreddit – 💬 Mojira Discord