[Bug] Keyboard profile change wipes keymap, wrong initial load

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Describe the Bug

I'm still trying out the web UI and I think there is a bug.
When I choose a keyboard (let's say k320 or eagle_viper) it may have multiple layouts.
And initially it loads fine (but if I'll use k320tkl then it's a wrong layout). And if I change the layout in the dropdown menu then all keys disappear. Is this supposed to happen?

It happens for two keyboards so I think it should happen to all of them.

Reproduction:

1. Open https://config.qmk.fm/#/duck/eagle_viper/v2/LAYOUT_all or https://config.qmk.fm/#/durgod/k3x0/k320/base/LAYOUT_all
2. Choose a different layout
3. Keymap values disappear

Also a bad layout is applied when navigating to a page where the keyboard layout is already picked.
Try opening this in a new tab: https://config.qmk.fm/#/durgod/k3x0/k320/base/LAYOUT_tkl_ansi

The default layout for this keyboard is all but if I open tkl one then most of the keys are mapped to wrong values.

Additional Context?

No response

[noroadsleft]

And initially it loads fine (but if I'll use k320tkl then it's a wrong layout). And if I change the layout in the dropdown menu then all keys disappear. Is this supposed to happen?

This is the expected behaviour. QMK Configurator only supports one default keymap per keyboard at this time. Changing the layout doesn't prompt Configurator to look for an appropriate default keymap.

Also a bad layout is applied when navigating to a page where the keyboard layout is already picked.
Try opening this in a new tab: config.qmk.fm/#/durgod/k3x0/k320/base/LAYOUT_tkl_ansi

This is a long-standing regression of sorts. QMK Configurator used to stay on the layout specified in the URL if you clicked a link that specified both a keyboard and a layout (without searching for a default keymap), but now it loads the default keymap all the time. I don't recall if this is by design, but it's been this way for a few years.

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I'm not sure how it's useful. Instead I expected a pre-filled tkl keymap. :/