Somehow LibreOffice Writer does not export hybrid PDFs correctly when PDF/A-1a was selected (or it does not open them correctly).
Steps to Reproduce:
1. create a document in LibreOffice Writer
2. File -> Export as... -> Export as PDF (roughly translated from German)
3. check "Hybrid-PDF" AND "PDF/A-1a (ISO 19005-1)"
4. export file
5. open created PDF file in writer
Writer displays the PDF as text:
> 2 0 obj
> <</Length 3 0 R/Filter/FlateDecode>>
Actual LibreOffice document can be edited with all previous formatting.
I suspect hybrid PDFs may not be possible with PDF/A but in that case I think the "Hybrid" checkbox should be inactive/disabled to ensure there is no data loss. (The user might rely on the ability to retrieve the document from the exported PDF without storing it separately.)
User Profile Reset: Yes
I'm using LibreOffice 188.8.131.52 from Fedora 29.
Cannot reproduce with Version: 184.108.40.206 (x64)
Build ID: fcd633fb1bf21b0a99c9acb3ad6e526437947b01
CPU threads: 12; OS: Windows 10.0; UI render: GL; VCL: win;
Locale: ru-RU (ru_RU); UI-Language: en-US
Could be platform-specific or version-specific. Could you please test with version 6.2? Please reset status to UNCONFIRMED when provided the answer.
You are right - version 220.127.116.11 (from Flathub) works (even with previously created files which means I did not loose data).