UI interaction prompt not showing, even though interaction works

I'm developing a game in Unity and I'm stuck on a problem I've been debugging for almost two days.

I have a LockedDoor script that allows the player to interact with a door by pressing E.
The interaction itself works correctly (dialogue starts, door unlocks, etc.), but the UI interaction prompt never shows.

The weird part is that:

I'm using the exact same logic in other scripts (dialogues, scene transitions)

In those scripts, the UI works perfectly

Here, the string never appears at all

I verified that:

The player enters the trigger correctly

Pressing E works

Localization is not the issue (I even added a debug fallback string)

Layers and colliders are correct

Forcing ui.target manually didn’t help either

The code below is never executed, even though the conditions should be met.

if (ui.target == null || ui.target == this.transform) { ui.target = this.transform; ui.Show(GetInteractionPrompt()); }

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Update

private void Update() { if (isOpened) return; if (playerInRange) { bool canInteractNow = CanInteract(); var ui = Inventory.UI.UIInteractionPrompt.Instance; if (ui == null) return; if (canInteractNow) { if (ui.target == null || ui.target == this.transform) { ui.target = this.transform; ui.Show(GetInteractionPrompt()); } if (Keyboard.current.eKey.wasPressedThisFrame) { CheckKey(); } } else { if (ui.target == this.transform) { ui.Hide(); ui.target = null; } } } }

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Interaction checks

public bool CanInteract() { if (isOpened) return false; if (DialogueManager.Instance != null && !DialogueManager.Instance.CanStartDialogue()) return false; if (Documents.DocumentManager.Instance != null && !Documents.DocumentManager.Instance.CanStartInteraction()) return false; if (!requireSpecificDirection) return true; return IsPlayerInCorrectDirection(); }

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Trigger detection

private void OnTriggerEnter2D(Collider2D other) { if (other.CompareTag("Player")) { playerInRange = true; playerTransform = other.transform; } } private void OnTriggerExit2D(Collider2D other) { if (other.CompareTag("Player")) { playerInRange = false; var ui = Inventory.UI.UIInteractionPrompt.Instance; if (ui != null && ui.target == this.transform) { ui.Hide(); ui.target = null; } } }

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Interaction prompt

public string GetInteractionPrompt() { string localized = interactionPrompt.GetLocalizedString(); if (string.IsNullOrEmpty(localized)) return "DEBUG: TEST PORTA"; return localized; }

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What I don’t understand

The same UIInteractionPrompt system works in other scripts

playerInRange is true

CanInteract() returns true

Pressing E works

But ui.Show() is never called (or has no visible effect)

What could prevent this UI from showing only in this script, even though the logic is identical?

Any help would be hugely appreciated 🙏