Form.List rules disables deeply nested Form.Item rules

[5argon]

• I have searched the issues of this repository and believe that this is not a duplicate.

Reproduction link

Steps to reproduce

• First press Submit and see that "No Letter A" and "No Letter Z" boxes are validated. Console outputs 4 errors from 2 "No Letter Z" from different list items, and 2 "No Letter A" from the same list item but on different deeper nested page.
• Enable the switch up top to add rules to the outer Form.List.
• Press Submit again and this time "No Letter A" rules are not activated. Console output 3 errors (4 + 1 - 2) instead of expected 5 errors. (4 + 1)

What is expected?

Expected the state after switch on the Form.List rules to add one more rule to count list items, console should output 5 errors.

What is actually happening?

Instead this rule also disables deeply nested Form.Item rules, "No Letter A" rule is no longer active. Console only outputs 3 errors.

Environment	Info
antd	4.16.2
React	17.0.2
System	MacOS
Browser	Edge