Window A/C units like this one need to be installed with a slope to the outside. Newer window A/C units do not drain all of the condensate from the bottom pan but collect it so the condenser fan can suck it up and spray it through the condenser fins. This increases the efficiency of the condenser and helps the unit comply with Energy Star requirements.
Excess condensate will eventually dribble out as it rises above the rim of the "drip hole".
It sounds like the unit in question is not installed with the proper slope towards the outside and condensate is accumulating too high at the inside.
Properly installed these window units almost look like they're starting to fall out of the window.
I don't have one in my TT but I do have a 12K unit in a window of my house. Only time I see dripping into my garden is when the humidity is high. The rest of the time the condenser fan sucks up enough and uses it to cool the condenser through evaporation.
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2018 Flagstaff Micro Lite 25BDS
2004 Nissan Titan