When you hit a mob with a sword with the sharpness enchantment, it doesn't display blue particles as in other versions like Legacy Console or Java Edition. It's a bug it has been in the game since a long time
Linked issues
Comments 2
Thank you for your report!
However, this issue has been closed as a Duplicate of MCPE-18704
It has been linked to this report. If you have additional information, please add it to that report.
Please search before reporting, as it's likely that one exists already.
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📓 Issue Guidelines – 💬 Community Support – 📧 Customer Support – 📖 Game Wiki
Thank you for your report!
However, this issue has been closed as a Duplicate of MCPE-18704
It has been linked to this report. If you have additional information, please add it to that report.
Please search before reporting, as it's likely that one exists already.
Quick Links:
📓 Issue Guidelines – 💬 Community Support – 📧 Customer Support – 📖 Game Wiki