Human input does not show response text from LLM

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### Dify version

1.14.2

### Cloud or Self Hosted

Self Hosted (Docker)

### Steps to reproduce

Checked in the Chrome and Edge browsers.

Add a chatflow with nodes:
1. User Input
2. LLM
3. Human Input: add llm text answer to `Form Content` in the node
4. Answer

eg:

Run App and write prompt, eg:

Now we can see the answer, but it will disappear. To show the disappearing answer bug in the Human Input node there are 2 ways (as far as I know):
1. Change the browser tab and come back to this App after ~ 10 minutes.
OR
2. Regenerate the answer, change answer to the first and next change to the second. Now both answers disappeared and we can see the `{{#llm.text#}}` placeholder instead.

### ✔️ Expected Behavior

1. Human input should refresh the last displayed text when you return after a few minutes to browser tab with the chat.
2. Human input should provide the ability to switch between response versions.

### ❌ Actual Behavior

Before regenerate:

Regenerate in progress...:

After regenerate:

When you regenerate and switch answer version to the first:

When you regenerate and switch to the second version of answer:

When you return to this browser tab after 10 minutes: