Created attachment 202265 [details] ODS with the issue 1. Open attached file 2. In the focused sheet 07, input 30 to G4 and save or save as Seems to be hanging. The file was originally an xlsx file, but I am unable to make a reproducer with it. Before commit d7214aba95bbdcbd40e87ef50fc66f2e2ec4f5ff the saving happens in a normal way, albeit a bit slowly, taking about 10 secs for me. Commit verified in both Linux and Windows 24.8 repos. I get it that the commit adds new functionality, so will not call this a regression.
Created attachment 202266 [details] Perf flamegraph of saving Unfortunately one interesting block in this flamegraph is just "unknown".
Created attachment 202276 [details] Original template-like XLSX file Here is the original blank XLSX file.