Unfortunately this is an elimination of the use of /click to circumvent maximum macro size with the 11.0 engine API.
Sited here.
99% certain we will not be getting it back, and trust me it was a surprise for me also, I have some rather interesting setups that no longer operate.
Its time for us to simply adapt because I doubt its ever coming back.
What you can expect going forward:
Additional neutering of the API so that circumventing the intent of the rules is impossible, this will likely also be coming soon to addons.