The Pitcher Plant crop, when planted on dry farmland (that is, farmland without a nearby water source) does not prevent that farmland from reverting to dirt.
This is inconsistent with other crops, which prevent this from happening to the farmland they are planted on.
Thank you for your report!
We're tracking this issue in MC-261176, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as working as intended, which means this is not considered a bug and won't be fixed. 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