Some of the GSP tags are missing from code auto-complete / code assist in STS/GGTS 3.6.0M1/3.5.1

I noticed that after upgrading to Grails 2.4.0, Groovy extension 2.3 in GGTS 3.5.1 and also STS, some of the GSP tags such as <g:form, or <g:message aren't recognized. They don't appear in the code completion list, also show yellow warnings when typed manually. This problem doesn't appear to be effecting Grails 2.3.6 projects in GGTS 3.5.1 Release.

I tried Grails 2.4.0 with IntelliJ trial version to verify, the tags showed up as expected. I'm not sure if Grails 2.4.0 contains certain changes in the GSP section that GGTS can't parse certain tags and recognize them.