With openssl 1.1.1 rsassa-pss is supported. During my tests I could successfully verify certificates or certificate chains where this algorithm was used.
Unfortunately the verification of a timestamp that was signed using rsassa-pss failed. After a look at the source code I noticed, that it is not supported in "openssl ts -verify". The functions as well as the error messages are missing.
Is it possible to add the corresponding code in one of the next sub releases?