[Bug/Question] Behaviour with multiple libraries

[v3DJG6GL]

I have about 40 libraries configured on my Jellyfin instance.
Besides a main movie library containing all movies, I have individual user libraries for some of my users. This gives them the possibility to see their own requested/curated movies.
I found out that with this setup, AI Chat is not really usable: I got a lot of these errors:

Internal error: rpc error: code = Internal desc = request (13009 tokens) exceeds the available context size (4096 tokens), try increasing it

I would need to set a huge context_size since all ~40 libraries are scanned for movie/series recommendations. That's why I excluded these libraries from Streamystats.

After excluding those user libraries, the statistic in Streamystats have changed: Although all movies are also present at main movie library, playback hours differs:

• All libraries activated:

• user library disabled:

But I cannot see a real difference:
with both user library disabled/enabled, I can see 365 items listed for this user. and also Total Plays is always 519.

And even top movies/series have the exact same count of plays:

• All libraries activated:

• user library disabled:

The same goes for Watchtime Statistics for e.g. the last 2 weeks: The total hours differs depending on enabling/disabling user libraries, but I cannot see any difference if I look at user Items table...

EDIT:
The Watch Time values at User Leaderboard on Dahboard does not change if I disable user libraries