unlike dragon eggs and bells, the cactus has a different issue. The model and selection boundaries imply that it is 14x16x14, when the hitbox is only 14x15x14. this can be easily seen by standing on top of a cactus (in creative, preferably), since your feet clip in to the block a little bit.
Thank you for your report!
We're tracking this issue as MC-52584, 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:
📓 Issue Guidelines – 💬 Community Support – 📧 Customer Support – ✍️ Feedback and Suggestions – 📖 Game Wiki
-- I am a bot. This action was performed automagically! Please report any issues in Discord or Reddit