• The values of chances.extraDropValue and chances.doubleDropValue not read from the config file (they do not change anything in the game)

• Also, the values in the JEI description do not change

Other bugs:

• Not quite correctly written about the chance of an extra drop. At first I thought that “a 0.5% chance to get a piece of coal dropped” refers to double drop, because there was no “extra drop” on the Coal Pickaxe. Maybe instead of "a chance to get a piece of coal dropped" was meant "a chance to get a double drop"?
• And the last one where it says "If you use this pickaxe, there is a..." shows all the tools, not just the pickaxe

Versions:

• Forge Version: 31.1.35
• Mod Version: morevanillalib-1.15.2-1.1 morevanillatools-1.15.2-2.0.2

I suppose if #5 #6 #8 issues are closed, then they have been resolved?

You're right, the text is still wrong. I forgot to change that. The values listed first are correctly read by the game. Did you generated a new world? Or did you change the config in the world folder? You need to do it because it's a server config. The config in defaultconfigs is only important if the config isn't in the world folder.
I'm confused by double drop and extra drop... I try to figure out the problems.
Yes, it shows all items and not just the pickaxe because it's much easier. Maybe I should improve the text but it will still be all tools of this material.

What I'm confused very much about is that you have 3 pages in JEI and I only have two. This page from the screenshot is the missing one. And I don't know why xD That's odd but not your problem.. :D Thank you for reporting.

Well, yes, re-creating the world solved the problem. It's just that this TEST world has already tested many different mods, I forget to recreate it. ¯\_(ツ)_/¯