JAX-RS Web Services are not returning GZIP responses after upgrading to JBoss EAP 6.4.14

Issue

After upgrading to JBoss EAP 6.4.14 we are seeing that our JAX-RS resources are not returning ZIP content anymore. It happens even when we have the org.jboss.resteasy.annotations.GZIP annotation on the JAX-RS methods.
When we use RESTEasy client we have an exception:

org.jboss.resteasy.spi.ReaderException: java.util.zip.ZipException: Not in GZIP format
    at org.jboss.resteasy.client.core.BaseClientResponse.readFrom(BaseClientResponse.java:466)
    at org.jboss.resteasy.client.core.BaseClientResponse.getEntity(BaseClientResponse.java:376)
    at org.jboss.resteasy.client.core.BaseClientResponse.getEntity(BaseClientResponse.java:351)
    at org.jboss.resteasy.client.core.extractors.BodyEntityExtractor.extractEntity(BodyEntityExtractor.java:62)
    at org.jboss.resteasy.client.core.ClientInvoker.invoke(ClientInvoker.java:127)
    at org.jboss.resteasy.client.core.ClientProxy.invoke(ClientProxy.java:89)
    at com.sun.proxy.$Proxy24.echo(Unknown Source)
    (....)
Caused by: java.util.zip.ZipException: Not in GZIP format
    at java.util.zip.GZIPInputStream.readHeader(GZIPInputStream.java:165)
    at java.util.zip.GZIPInputStream.<init>(GZIPInputStream.java:79)
    at java.util.zip.GZIPInputStream.<init>(GZIPInputStream.java:91)
    at org.jboss.resteasy.plugins.interceptors.encoding.GZIPDecodingInterceptor$FinishableGZIPInputStream.<init>(GZIPDecodingInterceptor.java:30)
    at org.jboss.resteasy.plugins.interceptors.encoding.GZIPDecodingInterceptor.read(GZIPDecodingInterceptor.java:47)
    at org.jboss.resteasy.core.interception.MessageBodyReaderContextImpl.proceed(MessageBodyReaderContextImpl.java:109)
    at org.jboss.resteasy.client.core.BaseClientResponse.readFrom(BaseClientResponse.java:430)
    ... 31 more