Experimentally, you can easily verify that 2MB is the actual limit, not 2048 characters.

For example, the following domain renders just fine, despite being ~2076 characters long: https://postman-echo.com/get?foo1=aaaaaaaaaaaaaaaaaaaaaaaaaa...

See the upstream chromium docs: https://chromium.googlesource.com/chromium/src/+/refs/heads/...

I don't think adding ~10 or so characters to the TLD meaningfully impacts this limit.