A player in survival doesn't take knockback if they have any potion effects to stop them from taking damage. This is not the case in earlier versions and breaks TNT launchers on bedrock edition.
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Comments 2
Thank you for your report!
We're actually already tracking this issue at MCPE-42731, so we will resolve and link this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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📓 Issue Guidelines – 💬 Mojang Support – 📧 Suggestions – 📖 Minecraft Wiki
Can you please include more information including steps to reproduce the problem:
Quick Links:
📓 Issue Guidelines – 💬 Mojang Support – 📧 Suggestions – 📖 Minecraft Wiki