Mutation results not preserved in browser after retesting mutant/function/module

[CyberiaResurrection]

Mutmut version: 3.3.0
Python version: 3.9.21
OS: Fedora Linux 41

After running a full mutation run, firing up mutmut browse results in the browser TUI and the mutant stats are displayed by class, as I would expect.

After retesting a mutant, a function and/or a module, the previous results are completely cleared, replaced by the retest results, rather than those results being updated with the retest results, as I would have expected.

[boxed]

Could you try update to 3.3.1 and try this again?

[CyberiaResurrection]

After updating to 3.3.1, I still get the same behaviour - no matter whether I'm retesting a mutant, a function, or a module, the previous results are still cleared.