Canon ceased production of the Canon TS-E 135mm f/4L Macro. The lens has been discontinued.
The Canon TS-E 135mm f/4L Macro was released in 2017, hence it is not that old. Never the less, it appears that Canon has decided its end of life has arrived. If we are not wrong, this is the first TS-E lens that gets discontinued.
However, B&H Photo still has the Canon TS-E 135mm f/4L Macro Tilt-Shift Lens in stock and ready to ship. Guess trhe “discontinuation process” starts in Japan, from where the here reported news is coming from.