Some RUN-Commands in UDEV-Rule are ignored

Running a raspberry pi and update to raspbian buster. With Jessie the same file works fine.
I used the following udev-rule:

# Idea from https://www.axllent.org/docs/view/auto-mounting-usb-storage/
KERNEL!="sd[a-z][0-9]", GOTO="media_by_label_auto_mount_end"
# Import FS infos
IMPORT{program}="/sbin/blkid -o udev -p %N"
# Get a label if present, otherwise specify one
ENV{ID_FS_LABEL}!="", ENV{dir_name}="%E{ID_FS_LABEL}"
ENV{ID_FS_LABEL}=="", ENV{dir_name}="usbhd-%k"
# Global mount options
ACTION=="add", ENV{mount_options}="relatime"
# Filesystem-specific mount options
ACTION=="add", ENV{ID_FS_TYPE}=="vfat|ntfs", ENV{mount_options}="$env{mount_options},utf8,gid=100,umask=002"
# Mount the device
ACTION=="add", RUN+="/bin/date >> /tmp/xx"
ACTION=="add", RUN+="/bin/mkdir -p /media/%E{dir_name}", RUN+="/bin/mount -o $env{mount_options} /dev/%k /media/%E{dir_name}",  RUN+="/bin/date >> /tmp/xx"
# Clean up after removal
ACTION=="remove", ENV{dir_name}!="", RUN+="/bin/umount -l /media/%E{dir_name}", RUN+="/bin/rmdir /media/%E{dir_name}"
# Exit
LABEL="media_by_label_auto_mount_end"

If I add my mp3-player a directory /media/MP3_INTENSO will be created and if I remove it, the directory will be deleted.

This only happens if I have the rule-file. So it’s definitely an effect of the file.

I tried udevadm monitor and find the expected:
UDEV [2378.210993] add /devices/platform/soc/3f980000.usb/usb1/1-1/1-1.2/1-1.2:1.0/host0/target0:0:0/0:0:0:0/block/sda/sda1 (block)

Running udevadm test /devices/platform/soc/3f980000.usb/usb1/1-1/1-1.2/1-1.2:1.0/host0/target0:0:0/0:0:0:0/block/sda/sda1 then returns:

dir_name=MP3_INTENSO
mount_options=relatime,utf8,gid=100,umask=002
TAGS=:systemd:
USEC_INITIALIZED=2377859838
run: '/bin/date >> /tmp/xx'
run: '/bin/mkdir -p /media/MP3_INTENSO'
run: '/bin/mount -o relatime,utf8,gid=100,umask=002 /dev/sda1 /media/MP3_INTENSO'
run: '/bin/date >> /tmp/xx'
Unload module index
Unloaded link configuration context.

It’s look like expected. I can successful run each command in the command line.
However I never found an entry in /tmp/xx if I only plugin the device and the device is never mounted.

I didn’t find anything in /var/log/messages or dmesg.

What’s wrong and what can I do for further analyse?

'/bin/date >> /tmp/xx'(err) '/bin/date: extra operand '/tmp/xx''
'/bin/date >> /tmp/xx'(err) 'Try '/bin/date --help' for more information.'