I can see where the loop cursor is positioned when in trim mode. But there I can’t see the slices I want to apply the looping points to. When in slice menu, no values are indicated while scrolling.

I have also prepared 9 samples with 128 steps each. Setting the loop point to exactly half of it in Ableton plays a perfect loop without any clicks. Setting it to the same position in OT trim mode (in this case L=4 for a sample that has S at 0 and E at 8) produces clicks.