TYPO3 Core

This is a weird bug. I set up a simple form with the built-in form extension. I can submit forms without problems in Firefox and Safari, also on iOS. But in Chrome the following thing happens:
On submit the page loads, but then basically opens the already open page. It feels like a page refresh. Now the URL has changed and includes all the form parameters, see below. When I hit submit again, then it sends the message successfully and the forwarding to the confirmation page works.

I also noticed this seems to happen in Chrome especially when I just cleared caches. It's a hard to track down, as the bug is so inconsistent.

These are the url parameters:

tx_form_formframework%5Baction%5D=perform&tx_form_formframework%5Bcontroller%5D=FormFrontend&cHash=87446385fd55f4728cedc400139c96a6#myform-354