some symbols in Lyx 2.2.0 throw error

[Michael Berger]

Dear Lyx friends,

in Lyx 2.1 I could use e.g. '\HandRight' in an ERT box to produce this 
symbol☞

but in Lyx 2.2.0 I get an errorwhile other symbolse.g. '\textcopyright' 
just work as before.

How can one identify which symbols from the comprehensive list of latex 
symbols do / do not work in Lyx 2.2.0 ?

PS: the hand symbol is neither listed in > Insert > Special characters > 
Symbols nor is it found under
> View > Toolbars ... Other Toolbars

Thanks for any help,
Michael