AttributeError when interacting with Sonos timelines

[nesati]

Describe the Bug

Traceback (most recent call last):
  File "/home/user/bug_report.py", line 10, in <module>
    for timeline in client.timelines():
                    ~~~~~~~~~~~~~~~~^^
  File "/home/user/miniconda3/envs/shadowloop/lib/python3.13/site-packages/plexapi/client.py", line 578, in timelines
    if t - self._timeline_cache_timestamp > 1:
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'PlexSonosClient' object has no attribute '_timeline_cache_timestamp'

Code Snippets

from plexapi.myplex import MyPlexAccount
from plexapi.server import PlexServer

baseurl = 'http://plexserver:32400'
token = '2ffLuB84dqLswk9skLos'
account = MyPlexAccount(token=token)
server = PlexServer(baseurl, token)

for client in account.sonos_speakers():
    for timeline in client.timelines():
        if timeline.key is not None:
            item = server.library.fetchItem(timeline.key)
            print(client.machineIdentifier, client.title, item)

Expected Behavior

I expect it to work like normal PlexClient without the exception

Additional Context

No response

Operating System and Version

Manjaro

Plex Media Server Version

1.41.6.9685

Python Version

3.13

PlexAPI Version

4.17.0