Opening the inventory when riding a pig or strider shows the player's inventory rather than the mob's

When opening the inventory when riding a horse, donkey, mule, llama or camel, the inventory screen for that mob is opened. However, doing the same on a pig or on a strider opens the player inventory screen rather than the pig's/strider's inventory, which does not seem correct at all.

How to reproduce

1. Ride your mob of choice
2. Open the inventory

Expected results

You would always enter the mob's inventory.

Actual results

You do not necessarily do so.

How to fix

Make it so that entering the inventory when riding a mob always opens the mob's inventory rather than the player's. This should preferably also be the case for mobs via /ride.