I'm using Chrome on Ubuntu 22.04.
The \operatorname Operator around \widetilde{div} doesn't work. The issue with the operatorname occures also in firefox.
Note that
\widetilde{\operatorname{div}}T
renders correctly while
\operatorname{\widetilde{div}}T
does not render correctly.
PS: The widetilde symbol (above div) is only a normal tilde in Chrome. However, that is an independent problem tracked in T352698.