Minecraft wiki entry for Strider, associated text: Baby strider riding on an adult strider.
Striders are occasionally ridden by a zombified piglin when spawned.
Striders can be ridden by baby zombified piglins too.
Three striders riding one another before 20w18a.
Strider out of the lava.
A comparison images of model differences between Java and Bedrock.
Player riding a strider riding a strider, with nearby striders looking on.