I think this might be related to the WoW Classic update earlier where /in stopped working. Here is my macro:
/cast Dismiss Pet
/in 4 /run SendChatMessage(UnitName("pet")..", go play!","say")

I get the error that an addon has failed. The line where /in is used does not happen. Just checking if this is the same issue as others have had where commands have become restricted. The macro does work without the /in being used, just not delayed like I like.

Thanks for any input you can provide.

Duplicate of #3