Let's take a look at who has benefited the most from the new (as in events not in 2018) events. In total 42 events have so far taken place that weren't in 2018.
Gold
Silver
Bronze
Total
China
17
11
4
32
India
5
5
3
13
South Korea
5
4
10
19
North Korea
3
3
1
7
Thailand
3
2
5
10
Kazakhstan
3
2
0
5
Chinese Taipei
2
2
2
6
Japan
1
2
2
5
Uzbekistan
1
2
2
5
Singapore
1
2
1
4
Iran
1
1
0
2
Hong Kong
0
2
1
3
Qatar
0
1
1
2
Kuwait
0
1
0
1
Macau
0
1
0
1
Sri Lanka
0
1
0
1
Indonesia
0
0
4
4
Vietnam
0
0
4
4
Afghanistan
0
0
1
1
Bangladesh
0
0
1
1
Kyrgyzstan
0
0
1
1
Malaysia
0
0
1
1
Mongolia
0
0
1
1
China tops the table, but India, South Korea and Thailand all had double digit medal gain. Does that mean China is stacking the event? Not really, China is by far the strongest nation so it's expected they would have the most medals. From a percentage point of view, the medals from the new events account for 16.4% of the total medals yet China's medals from the new event only account for 14.8% of their total medals so they are at around pace.
The biggest beneficiary of nations with more than 10 medals is North Korea whose new events account for 43.8% of their medal total. In their defense, the weightlifting medals are considered new events since the weight classes have changed, if we exclude those their share drops to 25%. After that nations benefiting the most are Thailand (38.5%), Singapore (36.4%), and India (34.2%). For Thailand and Singapore they mostly benefited from the sailing program while for India they benefited from the addition of team events in shooting.
The nations which benefited the least from the new events were Japan (4.8%), Malaysia (5.6%), Hong Kong (7.9%) and Iran (8.0%).