Created attachment 201440 [details] An invalid RTF 1. Open LibreOffice. 2. Use its File->Open, to try to open the attachment. 3. A format error message appears; click OK. => There is still the progress bar at the bottom, as if the loading is still ongoing. See bug 104650, where the same problem was fixed for DOCX.
Reproducible Version: 26.2.0.0.alpha0+ (X86_64) / LibreOffice Community Build ID: 33560caa34a6532fb27641c19d7cc3bb4dc33057 CPU threads: 16; OS: Windows 11 X86_64 (build 26100); UI render: default; VCL: win Locale: en-US (es_ES); UI: en-US Calc: CL threaded seems it happens from star center implementation Version: 4.4.7.2 Build ID: f3153a8b245191196a4b6b9abd1d0da16eead600 Locale: es_ES