Today I finally achieved a round beautiful number for Crown's Fall attractiveness: exactly 20000 on a normal day. This also means that my Palace is at Prestige level 12. See below:
All good, until the Beer Festival started. Plus, a World's Fair event: Sumptuous Architectural Exhibition. Now this exhibition normally boosts the attractiveness by 800. See below what happened instead:
The bonuses seem correct for the maximum Prestige level, which is 25 as I understand. Still, the game displays 34 as the level, instead of something like "Highest level achieved".
Below is what it looked like when the exhibition was over. For some reason, it didn't cap at 800 this time, although before I reached 20000 base attractiveness it used to work just fine: 400, 600 or 800.