Udev script stops after first command

Question

My udev rule points to a bash script with two commands. While the first command echo runs fine, the second line ifuse seems not to be executed.

$ cat /etc/udev/rules.d/test.rules

ACTION=="add", SUBSYSTEM=="usb", ENV{PRODUCT}=="5ac/12a8/804", ENV{INTERFACE}=="255/253/1" RUN+="/bin/sh /home/user/test.sh"

$ cat /home/user/test.sh

#!/bin/sh
echo "Phone connected" >> /home/user/test.log
sleep 3
/usr/bin/ifuse /home/user/media/iOS

Remarks:

• ifuse works if I execute the script manually: $ sh test.sh
• Replacing the udev RUN+ statement with "/bin/su user -c /home/user/test.sh" doesn't help
• Man page ifuse: https://www.mankier.com/1/ifuse