Ouch… You cannot just come here and say “X is borken!” no image no details no version, nothing. This is a good reminder for everyone to ask questions kindly. We are humans, like you. And no offence taken! But it is a good reminder to be nice 
Yes something might be broken, and so in this case please provide details (when?, where?, how?, what?). Then we shall have a look or answer when we can.
I just looked in 5.4 and substrate+decals are working for the tests and project we have but I guess we are missing some cases if you have something broken.
Thanks.