What changed in PKCS#1 v2.2, and why?
It's merely an update to align the hashing algorithms. There are in fact no real &quot;consequences&quot; which might have any negative impact as the v2.1 schemes are still supported. The positive impact is the alignment with FIPS 180-4.
To quote the revision history at page 59 of &quot;PKCS #1 v2.2: RSA Cryptography Standard&quot;:

Version 2.2 updates the list of allowed hashing algorithms to align them with FIPS 180-4, therefore adding SHA-224, SHA-512/224 and SHA-512/256.
The following substantive changes were made:
— Object identifiers for sha224WithRSAEncryption, sha512-224WithRSAEncryption and sha512-256WithRSAEncryption were added.
This version continues to support the schemes in version 2.1