after creating multiple singleplayer worlds and playing around in the configs, the mod does not seem to work at al.
I was hoping, that as per the original setting the block breaking speed would be doubled, but that seems to not have been the case. even after trying multiple times to get it to work with the instant break configuration 0.0, no changes in breaking speed could be identified.
game version 1.16.5

I'm sorry, but I cannot recreate this problem with said version.
Please attach more information, - attach your config file, upload a video of the problem you are having etc.