i just noticed that the example in the rules section readme is in error.
It handles about {galvanic alchemist} and an animated keystone being paired. While it is true the soulbond effect stops once keystone stops being a creature, it is the second part that is ambiguous. "They can always be paired later"
However, this only can if alchemist enters the battlefield while the keystone is animated and unpaired, you can't just pair them by animating the artifact again.
Maybe this example should get some attention.
Piotr moved this to rules, but it was actually a suggestion.