Before game version 1.21.1, the direction of entities entering the End retained their movement orientation (momentum) along the direction of the Overworld, as shown in the image. In version 1.21.1, concrete powder entering the End portal from the Overworld along the south and north directions would still retain its orientation in the End, maintaining the south and north direction. However, in the 1.21.4 version, in the same save, concrete powder entering the End portal along the south and north directions in the Overworld can be changed to face the west and east directions in the End. This bug has affected the use of my redstone machines. I discovered this bug in version 1.21.3, but it has not been fixed in the new version. The website has a file size limit, so I am unable to upload the video.
 
I have submitted the relevant save file as requested, which can be found in this link. It contains three files: two world folders and one file with save-related information. I hope this can help provide a report for the related bug.

https://reblock-my.sharepoint.com/:u:/g/personal/harasakinanodesu_reblock_onmicrosoft_com/EX91dD8b4VhIoG9keqPSPSwBmDnmLLRQ47eSuOc2s2cPtA?e=q4vER9