Last frame is not displayed when looping mp4/webm

[pkvaipc4j0]

The attached video file changes from '0' to '3' every second.
When played in a loop, the last frame '3' is not displayed and returns to '0'.
In chrome and firefox, the last frame '3' is displayed for 1 second and then returns to '0'.

XnView MP Windows
Version 1.4.2 64bits (Jan 23 2023)
Libformat version 7.136

[xnview]

right the problem comes from the MDK used, i contact the author...