Tilde plus number is invalid coordinate

In 1.12.2 and earlier, the following command worked, syntactically equivalent to, /setblock ~1 ~ ~ glass):

/setblock ~+1 ~ ~ glass

This command gives an error now:

Expected double at position 10: setblock ~<--[HERE]

While it was technically not to put in the + in, having it is nice if you want to be explicit.