iOS universal links (applinks) not working for subdomains

Question

Having an issue filtering allowed subdomains for my app's universal links.

Let's say i have those domains:

 - a.subdomain.domain.com 
 - b.subdomain.domain.com 
 - c.subdomain.domain.com

I want my app to be opened by a.subdomain.domain.com and b.subdomain.domain.com but not c.subdomain.domain.com.

As i understood it's not possible to exclude a subdomain in the association file hosted on the server, only path for that domain (with the "NOT /xxx/" in paths).

So went with the choice of allowing a list of subdomains instead of excluding one.

But it doesn't work as expected..

I uploaded association file on both a.subdomain.domain.com and b.subdomain.domain.com. Even on subdomain.domain.com. AASA file contains "paths": ["*"]

In my app entitlements i specified "applinks:a.subdomain.domain.com" and "applinks:b.subdomain.domain.com"

Doesn't open anything. Feels like when i'm adding more than the domain itself in the entitlements it stops working completely.

"applinks:*.domain.com" is fine but opens all the subdomains.

"applinks:a.subdomain.domain.com", "applinks:*a.subdomain.domain.com" or even "applinks:*.subdomain.domain.com" breaks everything.

An i missing something? Haven't found anything about subdomain not being allowed in entitlements, the way it's explained in the official Apple doc it should be working...