I tried with 1h and 2h weapons.
No weapons: I didn't get a bug - either jumping with e while "walking" or jumping auto with shift-running, both standing and crouching
1h weapons: I didn't get a bug - either jumping with e while "walking" or jumping auto with shift-running, both standing and crouching
2h weapons: I got a bug when walking + jumping with e ("interacting") - crouching and standing both lead to animation bug. I didn't get the bug with shift-running jumping.
For me, the condition to reproduce seem to be:
1 - Equip a 2h weapon (I tried with the initial bat)
2 - Jump a low-level fence while walking, using interaction. Either standing or crouching.
Did you perform any new tries? Standing x crouched, running (auto-jump) x walking (jumping with E), no weapon x 1h weapon x 2h weapon etc?
I got videos from all tests but since this is very specific the video I posted earlier (https://theindiestone.com/forums/index.php?/topic/26831-double-jumping-animation-linux-4120/ should be enough