BIGTREE_TFT35_V3.0_E3.27.x fails on e-step tuning with IDEX setup

[HappyHound]

I have an Ender 3 Pro with the Ender IDEX motherboard, dual extruders etc. I also have the TFT35 E3. I've installed the 3.27.0 firmware and have updated the e-stop on extruder 1 (T0) with the (very nice) e-step "wizard". But when I select extruder 2 (T1) and press the "Extrude 100mm", it selects says active extruder T0 and not T1. So there seems to be a bug there?