I have the same issue and it’s worse with the new controller app. I tailored my Amazon playlists to 500 tracks after Sonos had an issue and could shuffle play all 500 tracks. Now I can only shuffle load 100 tracks. very fed up with a CEO apology but no action to make this a simple control interface.

Still waiting for an answer 

I haven’t tested recently on Amazon Music but let’s hope the next update fixes this error if it’s still there:  

"Replace Queue", "Play Now" and "Shuffle" options put only 100 tracks from a playlist to the queue.

Note: the options “Add to End of Queue” and "Play Next" correctly put 100+ tracks to the queue in both old and new app.

As a workaround to shuffle longer playlist I used a playlist with 1 good track, replaced queue with that, then for the 100+ track playlist I used Add to End of Queue. I have shuffle option enabled.

Sadly I have tried everything and no success. Ironically a few years back we could shuffle play my whole Amazon list then Sonos so say improved the controller. The result only shuffle the first 500 tracks. So we spent hours organising 500 track playlists and that worked till this called upgrade, now down to 100 tracks. Now seriously regretting the investment in a Sonos system which I loved but with today’s functionality is sub standard at best. Constant glitches, hard to navigate and underperforming 

I started having same issue after upgrading to the new app. I have been in contact with Sonos regarding the issue, they troubleshooted through remote access on my phone and took a diagnostic report since over a month ago. When I followed up with them today, they said it has been escalated to Level 3 ( with their engineers). That they are still investigating and would reach out to me when they have any information. 

 Using iPhone 15 I just chose an Amazon Music playlist consisting of 600+ tracks.  Held down on it and chose Play Now.  Of course I got the obligatory Something Went Wrong error first.  The playlist finally loaded but of course did not start playing.  It did, however, load 500 tracks.  Why not all 600+ I don’t know.

 With the same playlist when I do Add to End of Queue I get the obligatory Unable to add to queue error after which it loads 500 tracks again.  Sonos is not allowing the process enough time to finish.  Easy fix that should not take this long.

 When I try the same thing with a Qobuz playlist of 808 tracks the error pops up as expected, but all 808 tracks load.  So I guess the 500 limit is on Amazon.

Tried this and it worked. Will use this as a walk around for now until it is fixed. Thanks 

Thanks for your info, yes the 500 limit from Amazon is well know and irritating. We tailored playlists to 500 for this but now Sonos is only selecting 100 of the 500 since the new controller was introduced. 
I have tried everything to overcome it and when talking to Sonos Support they said it’s a connectivity issue with my Wifii which is BS. This is a system software functionality issue stemming from the change 
Pity Sonos can’t listen to the saying “if it ain’t broken don’t fix it” because it used to work fine

come on Sonos it’s being going on long enough and we know the cause get it sorted!!!!