The "temporary modifier" argument accumulate is not working when a try /lp user <player> parent <group> addtemp <time> accumulate, has anything changed?

LuckPerms Version: 5.0.9
LuckPerms Extensions: extension-legacy-api-1.0.0
Vault: 1.7.3
Paper Version: 230

Can you provide more info? Like what happens when you run the command? What are you expecting to happen vs what actually happens. Screenshots are good.

I add a player to a group temporarily with the command:
/lp user Player parent Donor addtemp 30d accumulate

After 15 days I want to increase the time by 30 days in the same group.
/lp user Player parent Donor addtemp 30d accumulate

When sending command to check player's parent:
/lp user Player parent info

Should return the value of 45 days left, initial 15 plus 30 added.