Yet more defensive

Author: i-am-tom

pkg/pulumiyaml/run.go

@@ -2181,11 +2181,13 @@ func (e *programEvaluator) evaluatePropertyAccessTail(expr ast.Expr, receiver in
 				} else if !ok || prop.IsNull() {
 					receiver = nil
 				} else {
-					// Not-known-to-be-unknown properties inside maps containing unknowns
-					// should be treated as unknown during previews to ensure that we
-					// don't end up using old values.
+					// Not-known-to-be-unknown output/computed properties inside maps
+					// containing unknowns should be treated as unknown during previews to
+					// ensure that we don't end up using old values.
 					if e.pulumiCtx.DryRun() && x.ContainsUnknowns() && !prop.ContainsUnknowns() {
-						return unknownOutput(), true
+						if prop.IsOutput() || prop.IsComputed() {
+							return unknownOutput(), true
+						}
 					}
 
 					receiver = prop