Click handler not being triggered on custom element

[ranile]

Problem
Click handler not being triggered on custom element, but works fine for standard elements.

Steps To Reproduce
Steps to reproduce the behavior:

1. Clone /~https://github.com/hamza1311/yew/tree/yew-custom-element-bug-repro
2. npm install
3. trunk serve
4. Click on "+1" button
5. Notice the counter not increasing
6. Comment out <mwc-button {onclick}>{ "+1" }</mwc-button> and uncomment // <button {onclick}>{ "+1" }</button>
7. Click on "+1" button
8. The counter increases

Expected behavior
The counter should increase with mwc-button, just as it does with button

Environment:

• Yew version: git+/~https://github.com/yewstack/yew#59e2f827666b6eebdb52bed8d75abdc1529cc9b4 (lock file is in the repo)
• Rust version: rustc 1.62.0-nightly (878c7833f 2022-04-16), `rustc 1.60.0 (7737e0b5c 2022-04-04)
• Target, if relevant: wasm32-unknown-emscripten
• Build tool, if relevant: trunk
• OS, if relevant: Arch Linux
• Browser and version, if relevant: Firefox 99.0.1

Questionnaire

• I'm interested in fixing this myself but don't know where to start
• I would like to fix and I have a solution
• I don't have time to fix this right now, but maybe later