When you find a stronghold using eyes of ender or the /locate command, you are led to the "central spot" of the stronghold. In Java Edition, this spot is at the End portal, but in Bedrock Edition it is not.

How to reproduce
Use eyes of ender to find a stronghold. Make sure you know exactly where they are leading you, not just the general area. Alternatively, Dig down until you hit stone bricks.

Expected result

The stronghold is centered on the End portal.

Actual result

The End portal is a distance away from the stronghold.

For reference, this happened on seed 1296937755. The stronghold was centered on X -702, Z 114. The portal room is at -707, 15, 158.

Edit: I tested this again in 1.16.50 on seed -904523900. The end portal is at 165, 21, 2342, but the stronghold is centered at X 162, Z 2290.

Impacts

This is probably the cause of MCPE-52283, a bug where some strongholds generate with no portal room at all, but I am reporting it separately just in case.

Even though most strongholds do have a portal room, it can be difficult to find because of this bug. This is a problem, since the End portal is (for most players) the main reason to find a stronghold.