We just had to replace a bunch of SXT injectors (beige/gray pigtail) since we had flapping and/or links at 10M on a campus style install with SXT Lite5 devices.
After much swapping and experimentation we discovered replacing the beige/gray injector with either the white gigabit Mikrotik injector or other non-Mikrotik injectors resulted in a solid 100M link.
We stripped the jackets on the MT injectors and found the injectors do not use twisted pair from the plug to the jack. So there is 6" or more of untwisted wiring from jack to plug.....my jaw is still on the floor.
Again, this is the beige/gray pigtail, not the white gigabit injector. You can look at the plug and see black, red, green, white for wire colors.
While installers are diligently trying to keep pair untwist to a minimum, this injector negates those efforts by far.
This is a poor way to save cost and clearly out of spec with regard to TIA-568 untwist length of 13mm / 1/2".
We have also noticed that some of the injectors have a metal shell on the plug that is attached to a drain wire, but the wiring is the same. So if you are expecting a foil jacket, and stp with drain end to end, it's not there.
I have pictures.