Failing to preserve mtime upon import using ItemAdded Plugin / preserve_write_mtime

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Hello,

first of all thank you for the great program.

I use beets to correct metadata on the fly and do file organization into folders etc manually and use Beet import and beet update to refresh the database regularily.
My config file is below for reference.

One thing i have an issue with is, that upon every (beet) update all of the files are touched and have a new modified date, which is messing up my “recently added” tab in my Subsonic server.
I tried to use preserve_mtime but it doesn’t seem to work.
Is my config looking alright?
Any ideas would be greatly appreciated.

plugins: fetchart embedart convert scrub replaygain lastgenre chroma web importadded
directory: /music
library: /config/musiclibrary.blb
art_filename: albumart
threaded: yes
original_date: no
per_disc_numbering: no

importadded:
    preserve_mtimes: yes
    preserve_write_mtimes: yes

convert:
    auto: no
    ffmpeg: /usr/bin/ffmpeg
    opts: -ab 320k -ac 2 -ar 48000
    max_bitrate: 320
    threads: 1

paths:
    default: $albumartist/$album%aunique{}/$track - $title
    singleton: Non-Album/$artist - $title
    comp: Compilations/$album%aunique{}/$track - $title
    albumtype_soundtrack: Soundtracks/$album/$track $title

import:
    write: yes
    copy: yes
    move: no
    resume: ask
    incremental: yes
    quiet_fallback: skip
    timid: no
    log: /config/beet.log

lastgenre:
    auto: yes
    source: album

embedart:
    auto: yes

fetchart:
    auto: yes

replaygain:
    auto: no

scrub:
    auto: yes

replace:
    '^\.': _
    '[\x00-\x1f]': _
    '[<>:"\?\*\|]': _
    '[\xE8-\xEB]': e
    '[\xEC-\xEF]': i
    '[\xE2-\xE6]': a
    '[\xF2-\xF6]': o
    '[\xF8]': o
    '\.$': _
    '\s+$': ''

web:
    host: 0.0.0.0