Local variables that are DOM elements are not included in the "topFrame" field when pausing on breakpoints

[DanTup]

Here I have two local variables, a and i. a is a standard class and shows in the Locals section. i is a DOM element and does not (I don't know if that's the reason, but it's the only obvious difference):

Specifically, it's missing from the vars of the topFrame in the PauseBreakpoint event:

{
	"jsonrpc": "2.0",
	"method": "streamNotify",
	"params": {
		"streamId": "Debug",
		"event": {
			"type": "Event",
			"kind": "PauseBreakpoint",
			// ...
			"topFrame": {
				// ...
				"vars": [
					{
						"type": "BoundVariable",
						"name": "this",
						"value": // ...
					},
					{
						"type": "BoundVariable",
						"name": "context",
						"value": // ...
					},
					{
						"type": "BoundVariable",
						"name": "a",
						"value": // ...
					}
				],
				"kind": "Regular"
			}
		}
	}
}

[DanTup]

Tested again today (along with https://github.com/dart-lang/webdev/issues/2183) and the behaviour is the same - these items are missing from the topFrame.vars:

{
	"jsonrpc": "2.0",
	"method": "streamNotify",
	"params": {
		"streamId": "Debug",
		"event": {
			"type": "Event",
			"kind": "PauseInterrupted",
			"timestamp": 1727358455237,
			"isolate": {
				"type": "@Isolate",
				"id": "1",
				"number": "1",
				"name": "main()",
				"isSystemIsolate": false,
				"isolateGroupId": ""
			},
			"topFrame": {
				"type": "Frame",
				"index": 0,
				"code": {
					"type": "@Code",
					"id": "739",
					"name": "build",
					"kind": "Dart"
				},
				"location": {
					"type": "SourceLocation",
					"script": {
						"type": "@Script",
						"id": "4",
						"uri": "package:webdev_2183/main.dart"
					},
					"tokenPos": 1343,
					"line": 17,
					"column": 5
				},
				"vars": [
					{
						"type": "BoundVariable",
						"name": "this",
						"value": {
							"type": "@Instance",
							"id": "-8676362967872990568.1.5",
							"kind": "PlainInstance",
							"identityHashCode": 748956460,
							"class": {
								"type": "@Class",
								"id": "classes|package:webdev_2183/main.dart|MainApp",
								"name": "MainApp",
								"library": {
									"type": "@Library",
									"id": "package:webdev_2183/main.dart",
									"name": "package:webdev_2183/main.dart",
									"uri": "package:webdev_2183/main.dart"
								}
							},
							"length": 2
						},
						"declarationTokenPos": -1,
						"scopeStartTokenPos": -1,
						"scopeEndTokenPos": -1
					},
					{
						"type": "BoundVariable",
						"name": "context",
						"value": {
							"type": "@Instance",
							"id": "-8676362967872990568.1.504",
							"kind": "PlainInstance",
							"identityHashCode": 579777764,
							"class": {
								"type": "@Class",
								"id": "classes|package:flutter/src/widgets/framework.dart|StatelessElement",
								"name": "StatelessElement",
								"library": {
									"type": "@Library",
									"id": "package:flutter/src/widgets/framework.dart",
									"name": "package:flutter/src/widgets/framework.dart",
									"uri": "package:flutter/src/widgets/framework.dart"
								}
							},
							"length": 17
						},
						"declarationTokenPos": -1,
						"scopeStartTokenPos": -1,
						"scopeEndTokenPos": -1
					}
				],
				"kind": "Regular"
			}
		}
	}
}