Setting the minecraft:generic.gravity attribute higher than 0.1 stops you from being able to jump up a block. However, setting it higher than 0.84 makes it so you can jump up one block again.

Steps to reproduce:

1. Set gravity to 0.84

/attribute @s minecraft:generic.gravity base set 0.84

1. Notice you can't jump up a block
2. Set gravity to 0.85

/attribute @s minecraft:generic.gravity base set 0.85

Expected behaviour:
You shouldn't be able to jump up a block, since gravity is higher

Actual behaviour:
Setting gravity value higher than 0.85 allows you to jump up a block again