As noted in https://github.com/spring-projects/spring-boot/issues/41047#issuecomment-2581939911, we are currently missing documentation for base64: prefix support.
Comment From: vpavic
I think the documentation committed to close this is not valid for 3.3 as support for arbitrary base64-encoded Resource properties has only been added in 3.4 - see https://github.com/spring-projects/spring-boot/issues/41433.
Comment From: snicoll
Oh, that's very confusing then knowing that the code is available in 3.3.x and registered in META-INF/spring.factories.
Comment From: snicoll
I've adapted the doc for 3.3.x in 89ffe1a