It does not make sense that Level 19-20 is 3000 clicks on a building and it only levels up one worker level, but then Level 20-21 is also 3000 clicks and levels up two worker levels. The worker levels need to be reviewed.
#readjusted the leveling on the buildings
gloomy gorge
river glade
I don't see it as an issue. 19-20 has always had only 1 level increase. They aren't changing the benefits gained just because they added more levels to the buildings.
They already made it significantly easier to obtain level 20. Assuming even ticks per guild member, it used to cost 18.8g to get that 1 worker level. Now you're getting it for 3.2g. Wouldn't really make a lot of sense to decrease the cost significantly AND give you a higher worker level on the existing tiers. They want to keep new 41+ gated behind the new levels. There's nothing to rebalance prior to level 20 to make that work.