filter synthesis: omit Field-Backed JSONB Bubbles from Composed Filter References — only Table-Backed boundaries have a synthesized .filter to proxy to; a dangling proxy reference breaks downstream code generators consuming the exported registry. Fixture pins a bubble-typed property: omitted from the filter, raw schemas promoted, no phantom .filter.

src/database/compile/filter.rs

@@ -165,8 +165,16 @@ impl Schema {
         } else if db.enums.contains_key(custom) {
           Some(vec![format!("{}.condition", custom)])
         } else {
-          // Assume anything else is a Relational cross-boundary that already has its own .filter dynamically built
-          Some(vec![format!("{}.filter", custom)])
+          // Only a Table-Backed boundary has a synthesized Composed Filter to proxy to.
+          // A Field-Backed JSONB Bubble has none — omit it like an inline object rather
+          // than emit a dangling proxy reference, which breaks eager consumers of the
+          // exported registry (downstream code generators).
+          let base = custom.split('.').next_back().unwrap_or(custom);
+          if db.types.contains_key(base) {
+            Some(vec![format!("{}.filter", custom)])
+          } else {
+            None
+          }
         }
       }
     }