No width linking of brace layers

it was getting it form the master they are attached too and that is supposed to have a different width

Lib/glyphsLib/builder/glyph.py

@@ -219,22 +219,20 @@ def effective_width(layer, glyph):
     # The width may be taken from another master via the customParameters
     # 'Link Metrics With Master' or 'Link Metrics With First Master'.
     font = glyph.parent
-    master = font.masters[layer.associatedMasterId or layer.layerId]
-    metrics_source = master.metricsSource
-    if metrics_source is None:
-        width = layer.width
-    else:
-        metric_layer = font.glyphs[glyph.name].layers[metrics_source.id]
-        if metric_layer:
-            width = metric_layer.width
-            if layer.width != width:
-                logger.debug(
-                    f"{layer.parent.name}: Applying width from master "
-                    f"'{metrics_source.id}': {layer.width} -> {width}"
-                )
-        else:
-            width = None
-    return width
+    master = font.masters[layer.layerId]
+    if master:
+        metrics_source = master.metricsSource
+        if metrics_source:
+            metric_layer = font.glyphs[glyph.name].layers[metrics_source.id]
+            if metric_layer:
+                width = metric_layer.width
+                if layer.width != width:
+                    logger.debug(
+                        f"{layer.parent.name}: Applying width from master "
+                        f"'{metrics_source.id}': {layer.width} -> {width}"
+                    )
+                return width
+    return layer.width
 
 
 def to_ufo_glyph_color(self, ufo_glyph, layer, glyph, do_color_layers=True):