Did the Find command or src-address variable change in 3.1??

I had this command to remove a redirect rule in 2.9.x and now it appears broken in 3.13:

/ip firewall nat remove [/ip firewall nat find src-address=208.53.47.14]

Any ideas?

try

/ip firewall nat remove [/ip firewall nat find src-address="208.53.47.14"]