I'm not sure, but I assume that this also affects the master. This needs to be evaluated after a fix had been crafted.
To reproduce the issue download and unpack karaf-2.2.7; then add the attached jar to the deploy folder (which is basically  packed with tinybundles). Now, BEFORE starting karaf, edit etc/org.apache.karaf.features.cfg and add "war" to the bootFeatures. Now start Karaf. you see that the deploy folder bundle had been deployed BEFORE the war feature had been started. Therefore the bundle is missing some packages and is not refreshed as the new feature is available. When you refresh the bundle now manually it works.