Docker – 400 for url encoded path in amd based images

I have a very basic spring boot 3.3.6 app using spring cloud gateway to route request.
Below is the bean for configuring my routes.

@Bean
fun myRoutes(builder: RouteLocatorBuilder, openApiMap: Map<String, Map<HttpMethod, List<String>>>): RouteLocator {
    val openApiMap = <map of routes. key is the path>
    val routes =  builder.routes()
        .route { p: PredicateSpec ->
            p
                .path(*openApiMap.keys.toTypedArray())
                .uri("https://sample-base-uri")
        }
        .build()

        return routes
}

For local development, the base jdk image I use is arm64 based image. When I spin up I see no problems at all.
However, for remote environments, I use amd64 based image to deploy the app, and I see a weird issue when a path has got url encoded characters. This only happens in amd64 images or at least from what I could see.

For instance,

If the path is /user/1/file/-3CxBi2Z0t3GPhFXPKCnBw==, this gets encoded as /user/1/file/-3CxBi2Z0t3GPhFXPKCnBw%253D%253D and sent to the gateway, and assuming there is a route defined for /user/{userId}/file/{fileId} I would expect it to work properly.

For this encoded path, gateway fails with a BAD_REQUEST.
As I mentioned previously, this happens only when I use amd64 based jdk images and only for the routes with url encoding.

Another detail that might be helpful is that – this was working until I recently upgraded to spring boot 3.3.6 from 2.7.6 irrespective of the jdk base image type.

I tried to trouble shoot by enabling logging but there was nothing great that stood out to me as a reason.

Please let me know if you need more details on this.

Spring boot – 3.3.6
Spring dependency management version – 1.1.6
Java 17

Error Message:

  [6b71b82c] Completed 400 BAD_REQUEST