Back/Forward not working for Fastmail webapp

Just created a Webcatalog app for fastmail (https://betaapp.fastmail.com), however for some reason Back and Forward don’t work: the URL updates but it doesn’t automatically update the page itself (unless i refresh or click the URL bar and hit Enter).
Interestingly, if I create the webapp for another website and then open a tab to fastmail, Back and Forward work.
Please let me know what else I can provide to help troubleshoot.

Webcatalog Version 73.8.0
MacOS 26.3, ARM (M1)

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