If you enable "rotate with minecarts" in the settings and enter an end portal you will be rotated by 180 degrees.

If you have it disabled you will be rotated either 180 or 90 degrees depending on if you're facing the X or Z axis

This does not happen with the end exit portal, gateways nor nether portals (both ways). It only happens when you enter the end via end portal.

Before entering the portal:

After entering the portal:

Observed results

• You are rotated 180 degrees

Expected results

• You would keep facing the way you were facing (rotate with minecarts enabled)
• You would be made to face west like you usually are (rotate with minecarts disabled)