From 087dea4b15f43adf824ccedd82773b41fdb0b4e1 Mon Sep 17 00:00:00 2001
From: lawnjelly <lawnjelly@gmail.com>
Date: Sat, 15 Nov 2025 12:02:43 +0000
Subject: [PATCH] `FTI` - `Camera2D` accepts resets only after entering tree

---
 scene/2d/camera_2d.cpp | 13 +++++++++----
 scene/2d/camera_2d.h   |  4 ++++
 2 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/scene/2d/camera_2d.cpp b/scene/2d/camera_2d.cpp
index 9288ade5493..78957460a3e 100644
--- a/scene/2d/camera_2d.cpp
+++ b/scene/2d/camera_2d.cpp
@@ -307,10 +307,12 @@ void Camera2D::_notification(int p_what) {
 		} break;
 
 		case NOTIFICATION_RESET_PHYSICS_INTERPOLATION: {
-			// Force the limits etc. to update.
-			_interpolation_data.xform_curr = get_camera_transform();
-			_interpolation_data.xform_prev = _interpolation_data.xform_curr;
-			_update_process_callback();
+			if (_interpolation_data.accepting_resets) {
+				// Force the limits etc. to update.
+				_interpolation_data.xform_curr = get_camera_transform();
+				_interpolation_data.xform_prev = _interpolation_data.xform_curr;
+				_update_process_callback();
+			}
 		} break;
 
 		case NOTIFICATION_SUSPENDED:
@@ -365,6 +367,8 @@ void Camera2D::_notification(int p_what) {
 				_interpolation_data.xform_curr = get_camera_transform();
 				_interpolation_data.xform_prev = _interpolation_data.xform_curr;
 			}
+
+			_interpolation_data.accepting_resets = true;
 		} break;
 
 		case NOTIFICATION_EXIT_TREE: {
@@ -375,6 +379,7 @@ void Camera2D::_notification(int p_what) {
 			}
 			viewport = nullptr;
 			just_exited_tree = true;
+			_interpolation_data.accepting_resets = false;
 			callable_mp(this, &Camera2D::_reset_just_exited).call_deferred();
 		} break;
 
diff --git a/scene/2d/camera_2d.h b/scene/2d/camera_2d.h
index ff1a894a7bd..b686d574e2b 100644
--- a/scene/2d/camera_2d.h
+++ b/scene/2d/camera_2d.h
@@ -108,6 +108,10 @@ protected:
 		Transform2D xform_curr;
 		Transform2D xform_prev;
 		uint32_t last_update_physics_tick = UINT32_MAX; // Ensure tick 0 is detected as a change.
+
+		// Camera2D can only call get_camera_transform() without flagging warnings after setting up viewports
+		// during NOTIFICATION_ENTER_TREE, so we reject resets outside this lifetime.
+		bool accepting_resets = false;
 	} _interpolation_data;
 
 	void _ensure_update_interpolation_data();