For an unused ticket/voucher? I'm sure it's technically a "placeholder" date required by the technology, but the reality is they sold you a ticket with no expiration date so short of WDW closing they will need to honor it regardless of whatever the technology puts in as a placeholder expiration. However, the longer you wait to use it, the more likely that it won't be exactly what you originally purchased simply because of the changes that occur over time. If this is an AP voucher, it likely will activate in the form of whatever AP is current - which as many have found is different than the product purchased 2-3 years ago.
Thanks for your informative reply! I can definitely see (and we are already seeing) their product change as time goes by. I bought four Platinum Plus vouchers before the pandemic and I'm definitely OK with the equivalent / maybe highest tier AP available in the future.