You are unable to open your inventory while riding an untamed animal like horse, donkey, mule or llama.
How to reproduce:
1. Spawn a horse
2. Press E
What I expected: You will open your inventory when pressing E.
What actually happened: Nothing happened when pressing E
Thank you for your report!
We're actually already tracking this issue in MC-19104, so I resolved and linked this ticket as a duplicate.
However, that ticket has already been resolved. That means that 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|https://bugs.mojang.com/issues/
] in the future to see if the issue has already been reported.
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