I don't know what specific version starts the issues but,
Between 1.19 and 1.20 Minecraft can't read some predicates.

For instance, the file that I attached. This file can be read by 1.19 and I can utilize it with command blocks & Datapack but after 1.20 it can't be read.

the predicates "smokey" works fine but "stepping on" and "location" seems not to be working.

and more  Here's the message from game output

Couldn't parse element predicates:draft:step_layer2 - Not a json array: {"condition":"minecraft:entity_properties","entity":"this","predicate":{"type":"minecraft:player","stepping_on":{"block":{"blocks":["minecraft:snow"],"state":{"layers":2}}}}}

 
I've checked whether the jason is perfectly valid.
and it's still valid.

Could you fix the bugs as soon as possible?
This may be critical for making datapack. thx