PB14 and PB15 are the pins the GD32 uses to talk check the prog key. The

bootloader doesn't fully deconfigure them, leading to potentially bad
reads of column 0, so we turn them off ourselves

plugins/Kaleidoscope-Hardware-Keyboardio-Model100/src/kaleidoscope/device/keyboardio/Model100.cpp

@@ -130,6 +130,12 @@ void Model100KeyScanner::enableScannerPower(void) {
   //
   pinMode(PB9, OUTPUT_OPEN_DRAIN);
   digitalWrite(PB9, LOW);
+
+  pinMode(PB14, INPUT);
+  digitalWrite(PB14, LOW);
+  pinMode(PB15, INPUT);
+  digitalWrite(PB15, LOW);
+
 }
 
 void Model100KeyScanner::disableScannerPower(void) {