As suggested by @habazut over discord and looking at the Motor Shield schematics, A2 / A3 (which map to GPIO35 and GPIO34 on the Wemos D1 R32) better fit the current sensing purpose rather than GPIO36 and GPIO39
Thanks @FrightRisk! I see however that in the meantime 4.2.36 has been already tagged, so version.h needs to be updated (having this change under 4.2.37) or the tag moved forward to include this merge
As suggested by @habazut over discord and looking at the Motor Shield schematics, A2 / A3 (which map to GPIO35 and GPIO34 on the Wemos D1 R32) better fit the current sensing purpose rather than GPIO36 and GPIO39