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@user36733
In my younger days, my stem reacted like yours. An even older fellow club cyclists to me to do the following.
Tape over hole left by bolt, torn bike upside down, remove wheel and if applicable the mudguard exposing stem hole ( if you see what I mean) fill hole/ stem with vinegar. Leave at least 12 hrs, longer the better, drain vinegar, turn bike over twist stem and apply upward force. Stem should slowly free as acid will have broken reaction joint. If not repeat!