Zebra doesn’t even validate sprout transactions, anymore. They can only be created and validated by zcashd nodes which are planned to be fully deprecated in the near future. In any case, sprout txs have been extremely few and far-between, as well in somewhat small quantities (comparitively) after the last big withdrawl.
Sprout deprecation has been planned for like 6 years now at least. After CVE 2019-7167, it was just like “Migration Tools” everywhere and value pool deprecation discussions and eventually zip211. Sprout migration was a very prominent topic for a long time and thankfully most of the funds have been removed from the pool since then.