[4.1.0] UuidV1::fromString(...) is not instance of UuidV1 anymore - breaking change?

Describe the bug

Using the following code I was able to check whether $uuidString is a v1 UUID,

$validV1 = UuidV1::fromString('08a527be-8e7a-11e9-bc42-526af7764f64') instanceof UuidV1;

Now it returns false, so:

1. maybe it wasn't the best option to check it - how would you do it in 4.1?
2. regardless whether it's best or not solution - it looks like a breaking change which shouldn't happen in minor release