My group recently migrated from classic to New Google Sites. There were many things I was doing with classic sites and/or apps script's Sites Service I can't do
wlanapi
http-status-code-400
unity-test-tools
typescript4.0
searchkit
tray
expressiveannotations
cloudberry
mixins
ribbon-control
gns3
dynamic-keyword
jupyter-lab
pnotify
llblgenpro
win32ole
unspecified-behavior
goroutine
outlook-restapi
undocumented-behavior
wrangler
ansible-module
airflow-scheduler
android-optionsmenu
cometd
vysor
gtk2
rhel
contact-list
embedded-database