Twitches at each WP in guided mode (non-GPS)

I recently updated the firmware from 4.1.1 to 4.1.5 and tested it with a grid pattern flight. I noticed that at each WP there was a twitch. I looked at the logs and I find jumps in the PSC. I don’t know if this is a bug in 4.1.5 that was fixed in 4.2. It would be appreciated to get an extra pair of eyes on it.