Templated LLD doesn't delete triggers and graphs when ifAlias is changed

snmpwalk -v2c -c public localhost 1.3.6.1.2.1.31.1.1.1.18

IF-MIB::ifAlias.1 = STRING: lo
IF-MIB::ifAlias.2 = STRING: eth0

1. import attached template
2. create new host and link the template
3. LLD discover index from ifAlias and create items, triggers, graphs (screenshot 1, 2, 3, 4)
4. change ifAlias

snmpset -v2c -c public localhost 1.3.6.1.2.1.31.1.1.1.18.1 s "loopback"
snmpset -v2c -c public localhost 1.3.6.1.2.1.31.1.1.1.18.2 s "ethernet0"

5. LLD delete items immediately despite Keep lost resources period is 1 day, and doesn't delete triggers and graphs. Triggers and graphs are duplicated (screenshot 5, 6, 7, 8)