Spinning wheel after test donation

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Embedded the multistep donation form via short code.
GiveWP is running in test mode.
When completing test or offline donation the wheel keeps spinning.
“Step 4: Thank You” never shows up.

Donation emails are sent and do appear in reports etc.

No errors in the console. Donation confirmation page is loaded in the background (can see in dev tools “network” tab).

Any hint in what could be wrong?

Thanks!