Urls over a set length won't work

I'm tríing to get embed to work but I noticed that some urls won't work. I think it has something to do with url length. For reproduction of the issue use following config and Uel:

embed:
{
class: Embed,
inlineToolbar: itb,
config:
{
services:
{
falstad:
{
regex: /https?:\/\/(www\.)?falstad.com\/circuit\/circuitjs.html\?ctz=(.*)/,
embedUrl: 'https://www.falstad.com/circuit/circuitjs.html?ctz=<%= remote_id %>',
html: "",
height: 400,
width: 800,
id: (groups) => groups[1]
},
}
}
},

http://www.falstad.com/circuit/circuitjs.html?ctz=CQAgjCAMB0l3BWcMBMcUHYMGZIA4UA2ATmIxAUgpABZsAoANxAFowU8RcbX3Ox2UcBSpIq46AnoATVnioCUtfoKXSApgDMAhgFcANgBd6AJxDFC4QRa6QeCuPQDuchYLYcrSyM+VfzlopQvjbcvJ5hPswoCJZhMYGCCiLU4lCSMlx4PCgoPNjZ-mpaekaZ2NhxdlyVIGicxToGxrIVlvU1iUqNpS1Z+dUFOXl1IBpNZS5t-kP+PlO1YbORvglFeCreqxvrDfjBLhx7nNMd83Wxtjk7K4c31Ud1I+ePufmFbwf9-jQ2QefLaq-Kr2UwUGg8IIICFXIRgRw0SDYVg0fgYSzyOqIoQoAD6hBouMguMRpFxCCJsApxLxeIYiORiIU6IonjyaRQYHxhOJpOI5MpkGpuNpXIYLmhkMEwLmvklsJlKyAA

Halfway through the url it works well (meaning it will properly insert the iframe with the incomplete link) but the while url does not insert the embed iframe.