Sometimes some Mobs in the world, such as horses, dogs and sheeps are like they are frozen, they don´t move, sometimes (not everytime) you can´t attack them, you can´t puch them in any directions. If your sitting on a "frozen" horse, it will move a little bit on his location, if you try to controll it, the horse don´t move from the place. Only restarting the world helps temporarily. I don´t know, what could trigger this bug. (I also found the bug on the android version from bedrock, OS is android 9, Minecraft version is 1.16.100.)
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I have experienced the same thing with both horses and creepers.

Thank you for your report!
We're actually already tracking this issue at MCPE-71243, so I 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.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
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Thank you for your report!
We're actually already tracking this issue at MCPE-71243, so I 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.
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
I have experienced the same thing with both horses and creepers.