This plugin hasn't been updated in a long long time and if someone knows how to compile on gradle (I tried to improvise but it didn't work) the source code is here: https://github.com/heretere/hpwp
Spigot Link: https://www.spigotmc.org/resources/per-world-plugins-1-8-1-17-x.88018/
@DJPlayz, not worth it, I ended up trying both and they've got problems. For example ultimate blockregen has no tracking and just uses bukkit scheduler which ends up out of sync and half generating the mines so I'm just making a custom one. If you want it when it's done flick me a DM and I'll give you a copy.