I don't know about "Eurorail" passes, but the information on Eurail.com says the following:
The normal deadline for exchanging or returning your Pass has been
extended, so you can request an exchange or refund up until September
1st, 2021 if you purchased your Pass on or after June 1st, 2019 and
before April 1st, 2020
and
All travelers who purchased their Passes on or after June 1st, 2019
and before April 1st, 2020 are automatically entitled to a validity
extension (Passes without an activation date) or a Pass exchange
(Passes with an activation date)
There's a Customer Service contact button the website and I would suggest you fill out the details required and send in a request for your passes to get an official reply if you want to be certain of their future validity.