Added another workaround to the fix_related_bias_pins script for an
error that was shadowed by the first error that was fixed (in the
last commit), in which pin VNB was incorrectly assigned pg_type of
"nwell" and VPB was incorrectly assigned pg_type of "pwell".  The
"nwell" and "pwell" also need to be swapped, which is now taken
care of by the script.

VERSION

diff --git a/VERSION b/VERSION
index f0f99b9..af7d950 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-1.0.335
+1.0.336

sky130/custom/scripts/fix_related_bias_pins.py

diff --git a/sky130/custom/scripts/fix_related_bias_pins.py b/sky130/custom/scripts/fix_related_bias_pins.py
index 9948008..222b944 100755
--- a/sky130/custom/scripts/fix_related_bias_pins.py
+++ b/sky130/custom/scripts/fix_related_bias_pins.py
@@ -34,6 +34,7 @@
 
     related_re = re.compile('\s*related_bias_pin\s*:\s*"(.+)"\s*;')
     pg_re = re.compile('\s*pg_pin\s*\(\s*"(.+)"\s*\)\s*{')
+    well_re = re.compile('\s*pg_type\s*:\s*"(.+)"\s*;')
 
     for line in slines:
         pmatch = pg_re.match(line)
@@ -53,6 +54,19 @@
                 print('Warning: Unknown related bias pin ' + pin_str)
             current_pin = ''
 
+        wmatch = well_re.match(line)
+        if wmatch:
+            well_str = wmatch.group(1)
+            if well_str == 'nwell' and current_pin == 'VNB':
+                modified = True
+                line = line.replace(well_str, 'pwell')
+            elif well_str == 'pwell' and current_pin == 'VPB':
+                modified = True
+                line = line.replace(well_str, 'nwell')
+            else:
+                print('Warning: Unknown well type ' + well_str)
+            current_pin = ''
+
         fixedlines.append(line)
 
     # Write output