[Mainsite]Theme Builder is broken

[ltsukimoto]

I wanted to make a theme, but noticed that the colour selectors do not accept any input. The Colour selector opens, but the value is not set.
Opening the colour selector also shows the following error in console:

undefined:1 Failed to load module script: Expected a JavaScript-or-Wasm module script but the server responded with a MIME type of "text/html". Strict MIME type checking is enforced for module scripts per HTML spec.
vendor-DTY7PTjj.js:2 Error: Invalid color input: rgba(undefined,undefined,undefined,undefined)
    at ax (pg-index-DTpkmpFX.js:2:227057)
    at pg-index-DTpkmpFX.js:3:109
    at l (vendor-DTY7PTjj.js:2:15987)
    at Array.map (<anonymous>)
    at Pt (vendor-DTY7PTjj.js:2:16077)
    at Proxy.map (vendor-DTY7PTjj.js:2:26052)
    at pg-index-DTpkmpFX.js:3:80
    at Array.map (<anonymous>)
    at sx (pg-index-DTpkmpFX.js:3:65)
    at B.deep (pg-index-DTpkmpFX.js:28:366083)
Sr @ vendor-DTY7PTjj.js:2
vendor-DTY7PTjj.js:2 Error: Invalid color input: rgba(undefined,undefined,undefined,undefined)
    at ax (pg-index-DTpkmpFX.js:2:227057)
    at pg-index-DTpkmpFX.js:3:109
    at l (vendor-DTY7PTjj.js:2:15987)
    at Array.map (<anonymous>)
    at Pt (vendor-DTY7PTjj.js:2:16077)
    at Proxy.map (vendor-DTY7PTjj.js:2:26052)
    at pg-index-DTpkmpFX.js:3:80
    at Array.map (<anonymous>)
    at sx (pg-index-DTpkmpFX.js:3:65)
    at B.deep (pg-index-DTpkmpFX.js:28:366083)
Sr @ vendor-DTY7PTjj.js:2
xr @ vendor-DTY7PTjj.js:2
yr @ vendor-DTY7PTjj.js:2
br @ vendor-DTY7PTjj.js:2
Gr.s.call @ vendor-DTY7PTjj.js:2
b @ vendor-DTY7PTjj.js:2
yr @ vendor-DTY7PTjj.js:2
Ar @ vendor-DTY7PTjj.js:2
Promise.then
Er @ vendor-DTY7PTjj.js:2
Tr @ vendor-DTY7PTjj.js:2
P.c.scheduler @ vendor-DTY7PTjj.js:4
trigger @ vendor-DTY7PTjj.js:2
mt @ vendor-DTY7PTjj.js:2
notify @ vendor-DTY7PTjj.js:2
trigger @ vendor-DTY7PTjj.js:2
set value @ vendor-DTY7PTjj.js:2
y.onClick.a.<computed> @ pg-index-DTpkmpFX.js:23
yr @ vendor-DTY7PTjj.js:2
br @ vendor-DTY7PTjj.js:2
n @ vendor-DTY7PTjj.js:4

This bug was reproducible on both of my accounts, both on different Browsers (Firefox with a lot of plugins, bare chromium)

Steps to Reproduce:
Go to the Theme Builder
Select any of the colour pickers
Try selecting a colour

Spoiler: Screenshot

Example: Text colour should be purple, it's not.