when using the Liquify filter, there is a possibility that a separate layer

Please add your vote (and comment/s) to existing Feature Requests if they meet your wishes regarding Filters as Layers in general. 

it works but In my humble opinion, it would be a better idea if the liquid filter simply remembered the setting on a normal layer instead of a smart filter, as I suggested earlier, via a separate editing layer such as Curves, etc.

I interpreted »separate layer« from your original post to mean an edited second layer, as can be produced with Neutal Filters. 

That you actually meant Adjustment Layer-like Filter Layers (as they apparently exist in Affinity Photo) was not clear to me. 

This has long been the subject of Feature Requests like this one (13 years old): 

But improvements may be approaching …

Previously »Adjustments« processed each pixel individually which enabled Adjustment Layers to work fairly fast. 

In »Filters« on the other hand multiple pixels could determine the resulting appearance of one pixel and this could take too much computing for Photoshop to do it equally fast. 

Recently however a new Adjustment Layer-type named »Clarity and dehaze« has been introduced – which would, in the old parlance, qualify as a Filter rather than an Adjustment. 

So I hope (more) Filter Layers might be coming to Photoshop … 

convert to Smart Object, apply Liquify, and never reopen Liquify to undo.

I guess that’s the kind of nonsense that should make people wary of using a chatbot as a search engine. 

Of course one can reopen the Liquify Smart Filter to fine-tune the Liquify further. 

Could you please post a screenshot with the pertinent Panels (Toolbar, Layers, Channels, Options Bar, …) visible? 

Whether you find it relevant or not, that's fine, but I disagree.

It should be an adjustment layer like Curve, for example.

If you save the document as a PSD file and want to continue editing the next day, you can't do that with bleed. It's permanent. Did you actually read what chatgpt says about this? I've included that.

I'll leave it at that. Have a nice day.

I read the post with the Chat GPT text and as mentioned previously there was at least one problem. 

The Filter Liquify applied as a Smart Filter can be edited further the next day, the next week, whatever – just like a Curves Adjustment Layer. 

Anyway I am not sure what you mean – are you talking about changing the Canvas? 

Please explain what the actual problem is. (edit: Ideally with screenshots including the pertinent Panels and Dialog windows.)