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Yes, sigil is a Qt app. I suspected it was a style issue. Have you tried different gtk styles to see if it's related to one style in particular? Because I just set up a stock xubuntu 21.04 VM, and the tooltips on the system Sigil 1.4.3 seem to work fine.
You could add that unset command to Sigil's launch script (/usr/bin/sigil or /usr/local/bin/sigil depending on whether you're using the system sigil or the self-compiled).
Are you using third-party video drivers? Qt 5.15 could have some issues with non-proprietary drivers.
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